...Pathogens in Raw Filter Cake", J. Water PoUut. Contr. Fed., 39, 8, 1403, (1967). Duncan, WK y Kawata, K., "Discussion of Evaluation of Activated Sludge Thickening...Theories by RI Dick and BB Ewing",/. Sanit. Eng. Div., Proc. Amer. Soc. Civ. Eng., 94, SA2, 431, (1968). Eckenfelder, WW, Jr., Industrial Water Pollution...