Vijay Kishinchand Lalwani, Saeed Ahmed G Khokhar., Praveen Kumar Shakya, and Sunil R Meena. “Sewage Sludge Pretreatment for Enhanced Biogas Production”. Revista Electronica de Veterinaria 25, no. 2 (1): 1573-1579. Accessed October 19, 2025. https://veterinaria.org/index.php/REDVET/article/view/1896.