1. Direct Filtration Using Polyelectrolyte Coagulants;Letterman;Jour. AWWA,1979
2. Carns , K.E. Stinson , K.B. Knutson , J.A. Clay-Polymer Coagulation at a Direct Filtration Plant Proc. AWWA Calif.-Nev. Sec. Fall Conf., San Diego 1979
3. Normal Solutions and Indicator Solutions for Colloid Titration Wako-Pure Chem. Indus., Ltd. Osaka, Japan