Chizh, Nikolay A. “Endoscopic Cryosurgery”. Problems of Cryobiology and Cryomedicine 27, no. 1 (March 25, 2017): 3–18. Accessed April 19, 2024. https://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/1274.