Kalmykova, Z., M. Makova, L. Mezhov-Deglin, A. Lanin, I. Petrusenko, and V. Shafranov. “Portable Dedvices for Cryosurgery and Therapy”. Recent Contributions to Physics, vol. 2015, no. 3, Jan. 2015, pp. 76-77, https://bph.kaznu.kz/index.php/zhuzhu/article/view/829.