1. Coagulation of Water With Alum by Prolonged Agitation;Langelier;Eng. News-Rec.,1921
2. Properties of the Dispersed Phase as the Controlling Factor in the Flocculation of Turbid Water;Ludwig,1942
3. The Clarification of Turbid Waters by Flocculation With Alum;Ludwig,1942
4. Laboratory Flocculation of East Bay Sewage;Ludwig;Calif. Sew. Wks. J.,1941