G. Alarcón-Flores, B. Vásquez-Pérez, A. Peláez-Rodríguez, M. Villa-Garcia, S. Carmona-Téllez, J. A, C. Falcon, M. Aguilar-Frutis, and ., Electrical and structural characteristics of spray deposited (ZnO)$_{X}$-(CdO)$_{1 - X}$ thin films, Rev. Mex. Fís. 59, (2013).