“SYNTHESIS AND PROPERTIES OF THE SYSTEMS Eu1-XPrXBa2Cu4OY (0£X£0,5) AND Eu1-XTbXBa2Cu4OY (0£X£0,5): UDC 546.431’65’56”. Bulletin of the Taras Shevchenko National University of Kyiv. Chemistry, vol. 45, no. 2, Apr. 2008, pp. 38-39, https://chemistry.bulletin.knu.ua/article/view/8341.