Carrero, A., V. Sagredo, and J. Larionova. “Nanocrystals of Ni Doped ZnO Semiconductor by Sol-Gel Combustion Method”. Revista Mexicana De Física, vol. 62, no. 6, Jan. 2016, pp. 530-3, doi:10.31349/RevMexFis.62.6.530.