“SYNTHESIS AND PROPERTIES OF COMPOUNDS YBa2-xSrxCu3O7 AND YBa2-xCaxCu3O7: UDC 546.64.43.55”. 2016. Bulletin of the Taras Shevchenko National University of Kyiv. Chemistry 52 (1): 24-25. https://chemistry.bulletin.knu.ua/article/view/8581.