M. A. OBOLENSKII, S. V. CHISTYAKOV, A. A,. MIRONOV O. A. SMIRNOV, A. S. PANFILOV, I. V. SVECHKAREV, V.N.,CHEBOTAEV N.N. POPOV, V. N. MORGUN, V. I. BELETSKII, A. V. SONDARENKO, and I.Yu. SKRILEV, Carrier transfer kinetics, phase transition and fluctuation-enhanced phenomena in YBa₂Cu₃O_x, Low Temp. Phys. 16, (1990) [Fiz. Nizk. Temp. 16, 574-577, (1990)].