Mana Seingsanan. (1993) Dynamics of a model for the activated sludge process. Mahidol University,:ม.ป.ท.Mana Seingsanan. 1993. Dynamics of a model for the activated sludge process. ม.ป.ท.:Mahidol University,;Mana Seingsanan. Dynamics of a model for the activated sludge process. ม.ป.ท.:Mahidol University, 1993. Print.