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Almasi, A., Mosavi, A., Mohammadi, M., Godini, K., Zarei, A., Mohammadi, S., Saleh, E., & Azemnia, S. (2016). Efficiency of integrated ultrasonic and anaerobic digestion of oil refinery wastewater sludge. Global NEST Journal, 18(4), 771-777. https://doi.org/10.30955/gnj.001924