1. Hansen, J. Aa., Tjell, J. C. and Lassen, R. 1983. Sanitary phosphorus recovery for agriculture. paper presented at Int. Conf. Harmless Disposal of Communal and Other Organic Wastes with Special Regard to Farm Land Application. 1983, Budapest.
2. Design and Operation of a Pilot-Scale Biological Phosphate Removal Plant at Central Contra Costa Sanitary District