1. Odegaard, H. Treatment of anaerobically pretreated effluents. Proc. 5th Int. Conf. Anaerobic Digestion. Edited by: Hall, E.R. and Hobson, P.N. pp.225–238. Oxford: Pergamon Press.
2. Choate, W.T., Houldsworth, D. and Butler, G.A. Membrane enhanced anaerobic digesters. Proc. 37th Industrial Wastes Conf. pp.661–666. Lafayette, Indiana, USA: Purdue University.