Influence of Bi substitution on compounds properties Bi1. 8–xPb0. 2TlxSr2CaCu2Oy and Bi1. 8–xPb0. 2TlxSr2Ca2Cu3Oy - I. O. Korbut; D. D. Naumova; S. A. Nedilko (Ukrainian Chemistry Journal, 2013)