Perez, Y., Gonzalez, A., Castillo, J., Sanchez, A., Oliveira, P., & Pichara, C. (2019). Obtaining and characterization of pellets based on walnut shells, waste paper and paperboard. Revista Técnica Da Faculdade De Engenharia Da De Zulia, 42(3), 181-186. Obtido de http://www.produccioncientifica.luz.edu.ve/index.php/tecnica/article/view/30217