Aguilar Leyva, J., A. Maldonado, and M. de la L. Olvera. 2012. “Application of Thin Films of SnO2 and SnO2:Ru As Propane Sensors”. Superficies Y Vacío 25 (2):117-21. https://superficiesyvacio.smctsm.org.mx/index.php/SyV/article/view/215.