A. Altamirano-Cubas, G. A. Vergara Medina, W. Gosgot Angeles, and R. E. Iliquin-Fernandez, “Optimization of anaerobic digestion under psychrophilic conditions using plant biofilms: evaluation of biogas yield and quality in a rural tubular biodigester”, Renew. Energ. Biomass. Sustain., vol. 7, no. 2, pp. 28–39, Dec. 2025.