2008. 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. 45, 2 (Apr. 2008), 38–39.