Marchenko, V. S., L. N. Marchenko, N. Y. Yermakova, I. V. Sleta, and B. P. Sandomirsky. “Effect of Cryoapplication on Fractal Organization of Ultrastructure of Parodontium Soft Tissues in Destruction and Penumbra Zones”. Problems of Cryobiology and Cryomedicine, vol. 19, no. 3, Nov. 2009, pp. 301-1, https://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/254.