M. . MAKOBA, T. . MOALOSI, P.- Şerban AGACHI, E. . MUZENDA, and T. A. . MAMVURA, “CHARACTERIZATION OF BOTSWANA COAL FROM TWO COAL FIELDS: MABESEKWA AND MMAMABULA TO DETERMINE ITS COAL RANK”, Studia UBB Chemia, vol. 65, no. 2, pp. 243–256, Jun. 2020.