[1]
S. V. Lubenets, V. D. Natsik, L. S. Fomenko, H. .-J. Kaufmann, V. Bobrov, і A. N. Izotov, «Influence of oxygen content and structural defects on low-temperature mechanical properties of high-temperature superconducting single crystals and ceramics», Fiz. Nizk. Temp., вип. 23, вип. 8, с. 902–908, Сер 1997.