Leiva Mas, Jorge, Iván Rodríguez Rico, Pastora Martínez Nodal, and Cándido Quintana Perez. “Methodology for Calculating the Ecological Footprint in Industries”. Centro Azúcar Journal 37, no. 2 (April 1, 2010). Accessed June 7, 2025. http://centroazucar.uclv.edu.cu/index.php/centro_azucar/article/view/413.