Boyko, Y. I., V. V. Bogdanov, R. D. Markov, and R. V. Vovk. “Peculiarities of the Relaxation Processes in ReBa2Cu3O7-X (Re = Y, Ho) Single Crystals at Room Temperature in Air Atmosphere”. Journal of V. N. Karazin Kharkiv National University. Series Physics, no. 25, Jan. 2017, pp. 43-47, https://periodicals.karazin.ua/physics/article/view/9214.