Lizárraga-Lizárraga, G., Salais-Fierro, T. E., Saucedo-Martínez, J. A., Garza-Morales, R. and Sánchez-Aguilar, J. (2014) “Problem for Light Pipes and a Solution Proposal”, Journal of Applied Research and Technology, 12(5). doi: 10.1016/S1665-6423(14)70603-0.