S. Benramache, B. Benhaoua, and H. Bentrah, “Preparation of transparent, conductive ZnO:Co and ZnO:In thin films by ultrasonic spray method”, J. Nanostruct. Chem., vol. 3, no. 1 (December 2013), Jul. 2013, doi: 10.1186/2193-8865-3-54.