Rojas-Vargas, Julián, and Joseline Bogantes. “Quantification and Classification of Solid-Ordinary Waste of Universidad Nacional De Costa Rica into the Landfills”. Uniciencia 32, no. 2 (July 26, 2018): 57-69. Accessed November 26, 2020. https://www.revistas.una.ac.cr/index.php/uniciencia/article/view/10660.