• Morphology of Y1Ba2Cu3Oz and Y0,7Ba2Cu3Oz bulk samples depending on Ca-substitutionTerzieva, Stanimira; Stoyanova-Ivanova, Angelina; Zalamova, K.; Mikli, Valdek; Angelov, Christo; Kovachev, V.Journal of optoelectronics and advanced materials2005 / 1, p. 477-480 https://old.joam.inoe.ro/arhiva/pdf7_1/Terzieva.pdf