“SYNTHESIS AND PROPERTIES THE SYSTEM OF YxYBa2–xCu4O8±Δ, (0.05£х£0.2): UDC 546. 65’ 56’ 431”, Вісник: Хімія, vol. 45, no. 2, pp. 42–43, Apr. 2008, Accessed: Feb. 14, 2026. [Online]. Available: https://chemistry.bulletin.knu.ua/article/view/8343