J. H. Park, E. S. Yeom, J. J. Kim, S. J. Lee, “Measurement of helical valvular flows behind the human venous valve using ultrasound speckle image velocimetry”, 12th Int. Symp. on Particle Image Velocimetry, ISPIV-046, Poster, Haeundai Grand Hotel, 6/18/22, 2017