Ararat, C., J. Urresta, G. Torres, J. Rodríguez, and A. Ramírez. “Effect of the Ni and Sn Impregnation in the Microstructural and Textural Properties of SnO Nanoparticles”. Ingeniería Y Competitividad, vol. 13, no. 2, Dec. 2011, pp. 93-101, doi:10.25100/iyc.v13i2.2677.