BibikovaО. А., M. D. Volnianskii, and M. P. Trubitsyn. 2016. “Electric Conductivity of LiNaGe4O9:Cu Crystals”. Journal of V. N. Karazin Kharkiv National University. Series Physics, no. 23 (December), 117-19. https://periodicals.karazin.ua/physics/article/view/7788.