Aschariya Yamchareonwong. (1991) Preliminary investigation of modified anaerobic filter for treatment of hospital wastewater. Mahidol University,:ม.ป.ท.Aschariya Yamchareonwong. 1991. Preliminary investigation of modified anaerobic filter for treatment of hospital wastewater. ม.ป.ท.:Mahidol University,;Aschariya Yamchareonwong. Preliminary investigation of modified anaerobic filter for treatment of hospital wastewater. ม.ป.ท.:Mahidol University, 1991. Print.