Panova, E., K. Bulenova, P. Blynskiy, and I. Kenzhina. “Investigation of Ion Exchange Properties of Natural Clinoptilolite As a Sorbent of Cs-137”. Recent Contributions to Physics, vol. 2016, no. 3, Sept. 2016, pp. 58-64, https://bph.kaznu.kz/index.php/zhuzhu/article/view/914.