Nazyrov, Z., S. Lebedev, and R. Vovk. “Excess Conductivity of Y1-zPrzBa2Cu3O7-D Single Crystals”. Journal of V. N. Karazin Kharkiv National University. Series Physics, Vol. 1113, no. 20, Apr. 2015, pp. 83-86, https://periodicals.karazin.ua/physics/article/view/1500.