Khodusov, Valery D., and A. S. Naumovets. “ABOUT CONDITIONS OF EXISTENCE OF SECOND SOUND WAVES IN ISOTOPICALLY ENRICHED CRYSTALS 7LiF”. East European Journal of Physics 2, no. 2 (September 22, 2015): 59-64. Accessed May 1, 2024. https://periodicals.karazin.ua/eejp/article/view/4011.