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GOGA, F.; DUDRIC, R.; BIZO, L.-A. .; AVRAM, A. .; DIPPONG, T. .; KATONA, G. .; BORODI, G. .; ANTON, A. . INFLUENCE OF THE THERMAL TREATMENT ON THE COLOUR OF RO٠Al₂O₃ (R=Co, Ni) TYPE SPINEL PIGMENTS PREPARED BY A MODIFIED SOL – GEL METHOD. Studia UBB Chemia 2016, 61, 263-273.