Singh, A. K., R. M. Karmacharya, S. Vaidya, and P. Thapa. “Quantification of Superficial Venous Reflux by Duplex Ultrasound - Role of Peak Reflux Velocity and Reflux Time in the Assessment of Varicose Vein”. Journal of Nepal Health Research Council, Vol. 18, no. 3, Nov. 2020, pp. 442-7, doi:10.33314/jnhrc.v18i3.2558.