Nualyong, C. . “Open Ureterolithotomy Via Lumbotomy Incision Vs Laparoscopic Ureterolithotomy for Upper Ureteric Calculi”. Siriraj Medical Journal, vol. 51, no. 5, May 1999, pp. 332-6, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/246993.