1. Removal of phosphorous from waste water;Akiyama;Jap. Kokai Tokkyo Koho,1985
2. Solubilities of hydroxy apatite;Atherton,1940
3. Polyprotic acids;Buttler,1964
4. Mechanism of phosphorous removal by a coal/aluminum media filter;Collins,1986
5. Condensed phosphates;Emeleus,1973