Gastellóu, E., Morales, C., García, G., García, R., Hirata, G. A., Herrera, A. M., Galeazzi, R., Rosendo, E., Díaz, T., Romano, R. and Coyopol, A. (2019) “Structural and Optical Changes of Undoped GaN Layers Grown via Radio-frequency Magnetron Sputtering Obtained from GaN Powders”, European Journal of Engineering and Technology Research, 4(2), pp. 59–63. doi: 10.24018/ejeng.2019.4.2.1164.