Wangdi, Kinzang, Thinley Wangmo, Ugyen Sonam, Dechen Lhamo, and Kazuhiro Muramatsu. 2016. “Snow Depth Measurement Using Ultrasonic Sensor ”. Zorig Melong- A Technical Journal of Science, Engineering and Technology 3 (1):1-4. https://journal.cst.edu.bt/index.php/zm/article/view/5.