Borja Padilla, R., María M. Durán Barrantes, and M. Luque González. 1992. “Aerobic Purification of the Effluents Produced in the Olive Mill Wastewater Biomethanation Process”. Grasas Y Aceites 43 (1):20-25. https://doi.org/10.3989/gya.1992.v43.i1.1192.