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S. V. Lubenets, V. D. Natsik, L. S. Fomenko, H. -J. Kaufmann, V.S. Bobrov, and A. N. Izotov, Influence of oxygen content and structural defects on low-temperature mechanical properties of high-temperature superconducting single crystals and ceramics, Low Temp. Phys. 23, (1997) [Fiz. Nizk. Temp. 23, 902-908, (1997)] DOI: https://doi.org/10.1063/1.593440.