M.-I. TOMA, D. MARCONI, C. LUNG, M. POP, and A. POP, “STRUCTURE AND MORPHOLOGY OF ZnO FILMS CO-DOPED WITH AL AND RARE EARTH DEPOSITED BY SPRAY COATING TECHNIQUE”, Studia UBB Physica, vol. 67, no. 1-2, pp. 43–53, Dec. 2022.