K. Zaharieva, R. Titorenkova, V. Kostov-Kytin, P. Karakashkova, I. Yordanova, and P. Todorova, “Preparation and Catalytic Ability of Novel Manganese Carbonate Ore/Copper and Cobalt Oxide-based Composites for Ozone Decomposition and Discolouration of Malachite Green Dye”, C. R. Acad. Bulg. Sci., vol. 78, no. 12, pp. 1765–1774, Dec. 2025.