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2. Hammond , D. S. Sludge Removal by Centrifuging Amer. City Magazine 1972
3. Water Reclamation Studies at the South Lake Tahoe PUD;Slectha;Jour. WPCF,1967
4. Westerhoff , G. P. Alum Recycling: An Idea Whose Time Has Come? Wtr. and Wastes Engr 1973
5. Precoat Vacuum Filtration and Natural-Freeze Dewatering of Alum Sludge;Mahoney;Jour. AWWA,1972