top of page

Publications

Explore MFL’s achievements,

featuring publications, conference presentations, awards, and patents

International Journal (SCIE)

91. S. Ahn, S. Jo, W. Song, H. Lee, G. Ku, M. Kim, D. Kim, S. Song, 2025, "Characteristics of turbulent Taylor-Couette flow of low-viscosity fluid on plastron-covered superhydrophobic surface", International Journal of Heat and Fluid Flow, 114, 109805

90. [Editor's Pick] S. Ko, S. Lee, H. Ha, D. Yang, J. Lee, I. Jang, S. Song, 2025, "Refining wall shear stress measurements in four-dimensional flow magnetic resonance imaging through intra-voxel wall boundary consideration", Physics of Fluids, 37, 041907

89. [Editor's Pick] K. R. Senthil, J. Park, S. Song, 2025, "Effects of initial and operating conditions on the closed supercritical carbon dioxide Brayton cycle", Physics of Fluids, 37, 033353

88.5. [highlight] "Perfecting refrigerator freezers through magnetic resonance velocimetry", Physics of Fluids, Scilight, 471101

88. [Featured Article] H. Dong, C. Im, C. Kang and S. Song, 2024, "Enhancing flow uniformity and reducing turbulent kinetic energy in refrigerator freezers through magnetic resonance velocimetry-based structural modifications", Physics of Fluids, 36, 115178

87. C. Im, K. Seo, J. Cho, I. Jang and S. Song, 2024, "Flow analysis in a 37-pin wire-wrapped rod bundle for sodium-cooled fast reactor using magnetic resonance velocimetry. II. Detailed characterization and influence of wire angular position", Physics of Fluids, 36, 095109

86. C. Im, K. Seo, J. Cho, I. Jang and S. Song, 2024, "Flow analysis in a 37-pin wire-wrapped rod bundle for sodium-cooled fast reactor using magnetic resonance velocimetry. I. Validation and gross behavior", Physics of Fluids, 36, 095108

85. M. Kang, I. Jang and S. Song, 2024, "Effects of header design on thermal characteristics of multi-nozzle steam spraying", International Journal of Heat and Fluid Flow, 106, 109291

84. S. Kang, D. An, H. Ha, D. Yang, I. Jang and S. Song, 2024, "Denoising four-dimensional flow magnetic resonance imaging data using a split-and-overlap approach via singular value decomposition", Physics of Fluids, 36, 011906

83. H. Dong, C. Im, C. Kang, j. Cho, I. Jang and S. Song, 2023, "Investigation of flow behavior in a refrigerator machine room using magnetic resonance velocimetry", International Journal of Heat and Mass Transfer, 214, 124446

82. M. Cha, D. An, M. Kang, H. Kim, S. Kim, I. Cho, J. Hong, H. Choi, J. Cho, S. Shin, S. Song, 2023, "Correct Closure of the Left Atrial Appendage Reduces Stagnant Blood Flow and the Risk of Thrombus Formation: A Proof-of-Concept Experimental Study Using 4D Flow Magnetic Resonance Imaging", Korean Journal of Radiology, 24(7), 647-659

81. M. J. Benson, A. J. Banko, C. J. Elkins, D. An, S. Song, M. Bruschewski, S. Grundmann, T. Bandopadhyay, L. V. Roca, B. Sutton, K. Han, W. Hwang and J. K. Eaton, 2023, "MRV challenge 2: phase locked turbulent measurements in a roughness array", Experiments in Fluids, 64, 28

80. K. Ozasa, H. Kang, S. Song, S. Tamaki , T. Shinomura, and M. Maeda, 2021, "Regeneration of the Eyespot and Flagellum in Euglena Gracilis during Cell Division", Plants, 10, 2004

79. K. Ozasa, H. Kang, S. Song, S. Kato , T. Shinomura, and M. Maeda, 2021, "Temporal Evolution of the Gravitaxis of Euglena gracilis from a Single Cell", Plants, 10, 1411

78. I. Jang, H. Kang, S. Song, D. S. Dandy, B. J. Geiss, and C. S. Henry, 2021, "Flow control in a laminate capillary-driven microfluidic device", Analyst, 146, 1932

77. J. O. Lee,N. Choi, J.-W. Lee, S. Song, and Y.-P. Kim, 2021, "Rapid Electrokinetic Detection of Low-Molecular-Weight Thiols by Redox Regulatory Protein-DNA Interaction in Microfluidics", Sensors and Actuators: B. Chemical, 336, 129735

76. M. J. Benson, A. J. Banko, C. J. Elkins, D. An, S. Song, M. Bruschewski, S. Grundmann, D. D. Borup and J. K. Eaton, 2020, "The 2019 MRV challenge: turbulent flow through a U-bend". Experiments in Fluids, 61, 148

75. Y. S. Na, W. Lee and S. Song, 2020. "Behavior of the Density Interface of Helium Stratification by an Impinging Jet", Nuclear Technology, 206(4), 544-553

74. S. Kang, S. Ryu and S. Song, 2020, "Quantification of VIV-driven energy transfer for a circular cylinder with a pair of bumps at Reynolds number 150", Journal of Mechanical Science and Technology, 34(3), 1-9

73. G. Kim, S. Song, 2020, "Noise reduction of refrigerant two-phase flow using flow conditioners near the electric expansion valve",Journal of Mechanical Science and Technology, 34(2), 719–725

72. S. Ko, J. Lee, S. Song, D. Kim, S. H. Lee and J. Cho, 2019, "Patient-specific Hemodynamics of Severe Carotid Artery Stenosis Before and After Endarterectomy Examined by 4D Flow MRI", Scientific Reports, 9(1), 1-8

71. J. Lee, B. Yang, J. Cho, and S. Song, 2019, "Velocity and pressure visualization of three-dimensional flow in porous textiles", Textile Research Journal, 0040517519846078

70. P. Pendyala, H. N. Kim, H. S. Grewal, U. Chae, S. Yang, I. Cho, S. Song, E. Yoon, 2019, "Internal-Flow-Mediated, Tunable One-dimensional Cassie-to-Wenzel Wetting Transition on Superhydrophobic Microcavity Surfaces during Evaporation", Nanoscale and Microscale Thermophysical Engineering, 23(4), 275-288.

69. W. Lee, S. Song, Y. S. Na, and J. Kim, 2019, "Novel scaling law for long-term interface displacement of a stratified layer by erosion mixing due to turbulent impinging jet applicable to nuclear power plants" International Journal of Heat and Mass Transfer, 141, 1159-1167.

68. K. Ozasa, J. Won, S. Song, T. Shinomura and M. Maeda, 2019, "Phototaxis and photo-shock responses of Euglena gracilis under gravitaxis", AAlgal Research, 41, 101563

67. G. Kim, J. Lee, J. Park and S. Song, 2019, "Flow visualization and noise measurement of R410A two-phase flow near electric expansion valve for heating cycle of multi-split air-source heat pump", Applied Thermal Engineering, 157, 113712

66. H. Kang, I. Jang, S. Song and S. C. Bae, 2019, "Development of a Paper-Based Viscometer for Blood Plasma Using Colorimetric Analysis", Analytical Chemistry, 91, 4868-4875

65. B. Yang, J. Cho, J. Lee and S. Song, 2019, "Development of custom-made RF coil for magnetic resonance velocimeter with a high spatial resolution", Journal of Mechanical Science and Technology, 33 (4), 1681-1688

64. S. Ko, B. Yang, J. Cho, J. Lee and S. Song, 2019, "Novel and facile criterion to assess the accuracy of WSS estimation by 4D flow MRI", Medical Image Analysis, 53, 95-103

63. K. Ozasa, J. Won, S. Song and M. Maeda, 2018, "Behavior of Euglena gracilis under simultaneous competing optical and chemical stimuli", Algal Research, 35, 95-105

62. S. Jo, S. Ahn, H. Lee, C. M. Jung, S. Song and D. R. Kim, 2018, "Water-repellent Hybrid Nanowire and Micro-scale Denticle Structures on Flexible Substrates of Effective Air Retention", Scientific Reports, 8, 16631

61. S. Baek, S. Ko, S. Song and S. Ryu, 2018, "Numerical study of high-speed two-phase ejector performance with R134a refrigerant", International Journal of Heat and Mass Transfer, 126, 1071-1082

60. S. Baek and S. Song, 2018, "Numerical study for the design optimization of a two-phase ejector with R134a refrigerant", Journal of Mechanical Science and Technology, 32 (9), 4231-4236

59. K. Ozasa, J. Won, S. Song and M. Maeda, 2018, "Bio-inspired neurocomputing with 256 noise oscillators simulating photo response of Euglena cells", Applied Soft Computing, 70, 539-549

58. I. Jang, G. Kim, and S. Song, 2018, "Mathematical model for mixing in a paper-based channel and applications to the generation of a concentration gradient", International Journal of Heat and Mass Transfer, 120, 830-837

57. J. Won, W. Lee, and S. Song, 2017, "Estimation of the thermocapillary force and its applications to precise droplet control on a microfluidic chip", Scientific Reports, 7, 3062

56. J. Lee, S. Ko, J. Cho, and S. Song, 2017, "Validation of magnetic resonance velocimetry for mean velocity measurements of turbulent flows in a circular pipe", Journal of Mechanical Science and Technology, 31 (3), 1275-1282

55. I. Yoo, J. Hyon, S. Song, and Y. Kang, 2017, "On-chip encapsulation of quasi-amorphous photonic materials with controlled shell thickness", Science of Advanced Materials, 9 (2), 238-243

54. K. Ozasa, J. Won, S. Song, S. Tamaki, and M. Maeda, 2017, "Temporal change of photophobic step-up responses of Euglena gracilis investigated through motion analysis", PloS one, 12 (2), e0172813

53. S. Baek, S. Song, J. Lee, and J. Kim, 2016, "Nanoscale diameter control of sensory polydiacetylene nanoparticles on microfluidic chip for enhanced fluorescence signal", Sensors and Actuators B: Chemical, 230, pp. 623-629

52. K. Ozasa, J. Won, S. Song, and M. Maeda, 2016, "Autonomous oscillation/separation of cell density artificially induced by optical interlink feedback as designed interaction between two isolated microalgae chips", Scientific Reports, 6, 24602

51. J. Hyon, C. Seo, I. Yoo, S. Song, and Y. Kang, 2016, "Glassy photonic inks encapsulated in core-shell microcapsules for local electric field sensors", Sensors and Actuators B: Chemical, 223, pp. 878-883

50. S. Ko, and S. Song, 2015, "Effects of design parameters on cavitation in a solenoid valve for an electric vehicle braking system and design optimization", Journal of Mechanical Science and Technology, 29 (11), pp. 4757-4765

49. H. Choi, N. Choi, B. Lim, T.-W. Kim, S. Song, and Y.-P. Kim, 2015, "Sequential phosphorylation analysis using dye-tethered peptides and microfluidic isoelectric focusing electrophoresis", Biosensors and Bioelectronics, 73, pp. 93-99

48. I. Jang and S. Song, 2015, "Facile and precise flow control for a paper-based microfluidic device through varying paper permeability", Lab on a chip, 15, pp. 3405

47. I. Yoo, S. Song, K. Uh, C. W. Lee and J.-M. Kim, 2015, "Size-Controlled Fabrication of Polyaniline Microfibers Based on 3D Hydrodynamic Focusing Approach", Macromolecular Rapid Communications, 36, pp. 1272-1276

46. S. Hwang and S. Song, 2015, "Flow characterization of electroconvective micromixer with a nanoporous polymer membrane in-situ fabricated using a laser polymerization technique", Biomicrofluidics, 9, 034108

45. K. Ozasa, J. Lee, S. Song, M. Hara and M. Maeda, 2015, "Autonomous Pattern Formation of Micro-organic Cell Density with Optical Interlink between Two Isolated Culture Dishes", Aritificial Life, 21, Number 2

44. J. Hong, D.-H. Park, S. Baek, S. Song, C. W. Lee and J.-M. Kim, 2015, "Polydiacetylene-Embedded Microbeads for Colorimetric and Volumetric Sensing of Hydrocarbons", ACS Applied materials and interfaces, 7, pp. 8339-8343

43. [Highlight] J. Kim and S. Song, 2015, "On-chip high density droplet-on-template (DOT) array", Journal of Micromechanics and Microengineering, 25, 017001

42. J. Choi, J. Won and S. Song, 2014, "Facile moldless fabrication of disk-shaped and reed blood cell-like microparticles using photopolymerization of tripropylene glycol diacrylate", Journal of Micromechanics and Microengineering, 24, 127001

41. J. Kim, Y. Shin, S. Song, J. Lee and J. Kim, 2014, "Rapid prototyping of multifunctional microfluidic cartridges forelectrochemical biosensing platforms", Sensors and Actuators B: Chemical, 202, pp. 60-66

40. K. Ozasa, J. Lee, S. Song and M. Maeda, 2014, "Transient Freezing Behavior in Photophobic Responses of Euglena gracilis Investigated in a Microfluidic Device", Plant Cell Physiology, 55(10), pp. 1704-1712

39. J. Kim, J. Won and S. Song, 2014, "Dual-mode on-demand droplet routing in multiple microchannels using a magnetic fluid as carrier phase", Biomicrofluidics, Vol. 8, 054105

38. K. Ozasa, J. Lee, S. Song, M. Hara and M. Maeda, 2014, "Analog feedback in Euglena-based neural network computing – Enhancing solution-search capability through reaction threshold diversity among cells", Neurocomputing, Vol. 140, pp. 291-298

37. Y. S. Nam, I. Yoo, O. Yarimaga, I. S. Park, D. H. Park, S. Song, J. M. Kim, C. W. Lee, 2014, "Photochromic spiropyran-embedded PDMS for highly sensitive and tunable optochemical gas sensing", Chemical Communications, Vol. 50, 4251-4254

36. K. Ozasa, J. Lee, S. Song, M. Hara, M. Maeda, 2013, "Gas/liquid sensing via chemotaxis of Euglena cells confined in an isolated micro-aquarium", Lab on a Chip, Vol. 13, 4033-4039

35. I. Jang, S. Song, 2013, "A model for prediction of minimum coating thickness in high speed slot coating", International Journal of Heat and Fluid Flow, Vol. 40, 180-185

34. K. Ozasa, J. Lee, S. Song, M. Hara, M. Maeda, 2013, "Euglena-based Neurocomputing with two-dimensional Optical Feedback on Swimming cells in micro-aquariums", Applied Soft Computing, Vol. 13, 527-538

33. B. Park, S. Song, 2012, "Effect of Multiple Electrode Pairs on the Performance of a Micromixer using DC-Biased AC Electro-Osmosis", Journal of Micromechanics and Microengineering, Vol. 22, 115034 (6pp)

32. I. Yoo, S. Song, B. Yoon, J.M. Kim, 2012, "Size-Controlled Fabrication of Polydiacetylene-Embedded Microfibers on a Microfluidic Chip", Macromol. Rapid Commun. 2012, 33, 1256-1261

31. Y.S. Jang, S. Song, 2012, "Rheology of conductive ink flow for printed electronics on a microfluidic chip", Exp. Fluids, Vol. 53, 1-7

30. J. Seo, T.J. Lee, S. Ko, H. Yeo, S. Kim, T. Noh, S. Song, M.M. Sung, and H. Lee, 2012, "Hierarchical and Multifunctional Three-Dimensional Network of Carbon Nanotubes for Microfluidic Applications", Adv. Mater., 24, 1975-1979

29. K. Ozasa, J. Lee, S. Song, M. Hara, and M. Maeda, 2011, "Implementation of Microbe-Based Neurocomputing with Euglena Cells Confined in Micro-Aquariums", Int. Journ. of Unconventional Computing, Vol. 7, pp. 481-499

28. S. Baek, and S. Song, 2011, "A One-Step Photolithography Method for Fabrication of a Staggered Herringbone Mixer Using Inclined UV Lithography", J. Micromech. Microeng., vol. 21, 077001

27. K. Ozasa, J. Lee, S. Song, M. Hara, and M. Maeda, 2011, "Two-dimensional optical feedback control of Euglena confined in closed-type microfluidic channels", Lab Chip, vol.11, p1933-1940

26. G. Kim, S. Song, J. Lee, and J. M. Kim, 2010, "Size-Controlled Fabrication of Supramolecular Vesicles for the Construction of Conjugated Polymer Sensors with Enhanced Optical Properties", Langmuir, Vol. 26, No. 23, 17840-17842

25. I. Yoo, B. Yoon, and S. Song, 2010, "Probing Temperature on a Microfluidic Chip with Thermosensitive Conjugated Polymer Supramolecules", Bull. Korean Chem. Soc. v31, No.6, p1753-1756

24. H. Hwang, S. Song, and J.M. Kim,2010, "Reversible Modulation of Fluorescence Signal of Conjugated Polydiacetylene Supramolecules in a Microfluidic Sensor Chip", Bull. Korean Chem. Soc. v31, No.2, p273-274

23. S.H. Eo, K.J. Won, S. Song, B. Yoon, and J.M. Kim , 2010, "Hemoglobin Detection on a Microfluidic Sensor Chip with a Partially Conjugated Polymer", Bull. Korean Chem. Soc., Vol.31, No.2, p467-469

22.S. Ryu, I. Yoo, S. Song, B. Yoon, and J.M Kim, 2009, "A Thermoresponsive Fluorogenic Conjugated Polymer for a Temperature Sensor in Microfluidic Devices", J. Am. Chem. Soc., 131 (11), p3800-3801.
* This work was introduced in Research Highlights of Lab-on-a-Chip (2009, v9, p1165).

21. B. Yoon, K.J. Won, S. Song, J.M Kim, 2008, "A Fluorescence “Turn-On” Microfluidic Sensor Based on an Acenaphthopyrrolcarbonitrile Derivative", Bull. Korean Chem. Soc. v29, No.11, p2095-2096.

20. J.S. Kwon, J.S. Maeng, M.S. Chun, S. Song, 2008, "Improvement of microchannel geometry subject to electrokinesis and dielectrophoresis using numerical simulations", Microfluid Nanofluid.v5, p23-31.

19. H.J. Hwang, S. Song, 2008, "The Effects of Grooves on the Flow Rate in a Microchannel", BIOCHIP JOURNAL.Vol. 2, No. 2, p123-126.

18. S. H. Eo, S. Song, B. Yoon, J. M. Kim, 2008, "A Microfluidic Conjugated-Polymer Sensor Chip", Adv. Mater. v20, p1690-1694.

17. M.S. Kim, K.S. Lee, S. Song, 2008, "Effects of pass arrangement and optimization of design parameters on the thermal performance of a multi-pass heat exchanger", Int. J. Heat and Fluid Flow, v29, p352-363.

16. B.S. Park, S. Song, 2007, "Investigation on Coating Methods of a Self-Assembled Monolayer on PDMS (Poly (dimethylsiloxane)) Surface", BIOCHIP JOURNAL. Vol. 1, No. 2, p140-143.

15. Y.H. An, S. Song, 2006, "Fabrication of a CNT Filter for a Microdialysis Chip", MOLECULAR & CELLULAR TOXICOLOGY, Vol.2, No.4, p279-284.

14. H.H. Yoo, S. Song, K.S. Jung, K.Y. Kim, 2006, "Nonlinear Structural Dynamic Analyses of Micro Cantilever Beams Actuated by Electrostatic Force", Key Engineering Materials, v321-323, p2619-2625.

13. D.K. Yang, K.S. Lee, S. Song, 2006, "Fin Spacing Optimization of a Fin-Tube Heat Exchanger under Frosting Conditions", Int J Heat Mass Transfer, v49, p2619-2625.

12. J.S. Maeng, K.S. Yoo, S. Song, 2006, "Modeling for Fluid Mixing in Passive Micromixers Using the Vortex Index", JKPS, V48, p902-907.

11. S. Song, K.Y. Lee, 2006, "Polymers for Microfluidic Chips" Macromolar Research, v14, p121-128.

10. D.K. Yang, K.S. Lee, S. Song, 2006, "Modeling for Predicting Frost Behavior of a Fin-Tube Heat Exchanger", Int J Heat Mass Tran, v49, p1472-1479.

9. S. Song, A.K. Singh, 2006, "On-chip Sample Preconcentration for Integrated Microfluidic Analysis", Anal. Bioanal Chem. v384, p41-43.

8. S. Song, A.K. Singh, and B.J. Kirby, 2004, "Electrophoretic concentration of proteins at laser-patterned nanoporous membranes in microchips", Anal. Chem., v76, p4589-4592.

7. C.D. Aubertine, J.K. Eaton, and S. Song, 2004, "Parameters controlling roughness effects in a separating boundary layer", Int. J. Heat and Fluid Flow. v25, p444-450.

6. S. Song, and J.K. Eaton, 2004, "Flow structures of a separating, reattaching, and recovering boundary layer for a large range of Reynolds number", Exp. Fluids, v36, p642-653.

5. S. Song, A.K. Singh, T.J. Shepodd, and B.J. Kirby, 2004, "Microchip dialysis of proteins using in-situ photopatterned nano- porous polymer membranes", Anal. Chem., v76, p2367-2373.

4. S. Song, and J.K. Eaton, 2004, "Reynolds number effects on a turbulent boundary layer with separation, reattachment, and recovery", Exp. Fluids, v36, p246-258.

3. S. Song, and J.K. Eaton, 2002, "The effects of wall roughness on the separated flow over a smoothly contoured ramp", Exp.Fluids, v33, p38-46.

2. P.A. Durbin, G. Medic, J-M. Seo, J.K. Eaton, and S. Song, 2001, "Rough wall modification of two-layer k-e", ASME, J. Fluids Eng., v123, p16-21.

1. S. Song, D.B. DeGraaff, and J.K. Eaton, 2000, "Experimental study of a separating, reattaching, and redeveloping flow over a smoothly contoured ramp", Int. J. Heat and Fluid Flow, v21, p512-519.

Domestic Journal

8. M. H. Ariffudin, I. Jang, S. Song, 2023, "Development of Non-Invasive Pressure Estimation Using 3D Multi-Path Line Integration Method from Magnetic Resonance Velocimetry (MRV)", Journal of the Korean Society of Visualization, Vol. 21, No.2, pp. 12~23

7. C. Choi, S. Choi, S. Song, 2017, "Design and Performance Evaluation of Visualization System for Measuring the Void Fraction of Two-phase Flow", Journal of the Korean Society of Visualization, Vol. 15, No.1, pp. 11~18

6. B. Yang , J. Cho, 2016, "Development of Solenoid RF coil for 4.7 T Magnetic Resonance Velocimeter to Improve Resolution", Journal of the Korean Society of Visualization, Vol. 14, No. 2, pp. 40~45

5. K. Ko, J. Moon, H. Yoon and S. Song, 2015, "Experimental Analysis on Hydroplaning Inhibition by Air Jetting Devices", Journal of the Korean Society of Visualization, Vol. 13, No. 2, pp. 33~37

4. I. Yoo and S. Song, 2014, "Microfluidic Fabrication of Conjugated Polymer Sensor Fibers", Trans. Korean Soc. Mech. Eng. B, Vol. 38, No. 10, pp. 853~858

3. J. Lee, S. Song and J. Cho, 2014, "Validation of Magnetic Resonance Velocimetry by Turbulent Pipe Flow", JKSV, Vol. 12, No. 1, pp. 35-42

2. H. Song, J. Park, and S. Song, 2008, "Numerical Analysis on Flow Characteristics Around a Cavity with Flaps", KSME, Vol. 32, No. 9, pp. 645-651

1. J.S. Kwon, J.S. Maeng, S. Song, 2007, "Development and validation of numerical program for predicting electrokinetic and dielectrophoretic phenomena in a microchannel", KSME(B), Vol. 31, No. 4, p320-329.

International Journal (Non-SCIE)

5. G. Song, K. Jang, W. Song, W. Choi and S. Song, 2025, "Cyclone negative pressure pump for efficient purification of airborne contaminants", Indoor Environments, Volume 2, Issue 1, 100073

4. K. Ozasa, J. Won, S. Song and M. Maeda, 2015, "Toxic Effect Monitoring by Analyzing Swimming Motions of Microbial Cells Confined in Microfluidic Chip with Micro-Trench Flow Injection", Procedia Engineering, Vol. 168, 1450-1453

3. K. Ozasa, J. Lee, S. Song and M. Maeda, 2015, "Real-time analysis of chemotactic motion of Euglena cells confined in a microchip toxicity sensor", Key Engineering Materials, Vol. 644, 185-188

2. K. Ozasa, J. Lee, S. Song, M. Hara and M. Maeda, 2014, "Chemical Sensing via Chemotaxis of Euglena Gracilis Confined in An Isolated Micro-Aquarium", Key Engineering Materials, Vol. 605, pp. 95-98.

1. K. Ozasa, J. Lee, S. Song, M. Hara, M. Maeda, 2013, "Microfluidic Gas Sensing with Living Microbial Cells Confined in a Microaquarium", Key Engineering Materials, Vol. 543, 431-434

bottom of page