Microstructure and thermal properties of quasi-equal rare earth substitution Y0.5Gd0.5Ba2Cu3O6.94 superconductorTerzieva, Stanimira; Stoyanova-Ivanova, Angelina; Shivachev, Boris; Terzijska, Bonka; Zaleski, Andrzej; Misiorek, Halina; Mikli, ValdekCentral European journal of physics2009 / 1, p. 84-88 https://www.degruyter.com/document/doi/10.2478/s11534-008-0133-y/html Synthesis and superconducting properties of Nd0.33Eu0.08Gd0.58Ba2Cu3Oz materialsStoyanova-Ivanova, Angelina; Terzieva, Stanimira; Shivachev, Boris; Mikli, Valdek; Vladimirova, LatinkaCentral European journal of physics2008 / 1, p. 76-79 : ill https://www.degruyter.com/document/doi/10.2478/s11534-007-0044-3/html