V. I. Nefedov, A. N. Sokolov, A. R. Vinogradov, T. A. Fomina, N. G. Shuranova, K. G. Oksenoid, G. I. Ramendik, E. A. Volkov, “Changes in the Composition and Properties of High-<i>T</i><sub>c</sub>; Superconducting Ceramics YBa<sub>2</sub>Cu<sub>3</sub>O<sub>6.5+δ</sub> after Passage of a Direct Current”, Mendeleev Commun., 2:1 (1992), 21–22
