1. Ferrando, R. and Theodosiades, G. (1960).La melasse dans l'alimentation du betail, p. 340, Vigot Fr�res, Paris.
2. Gil-Pe�a, M.L., Sardinero, E., Garc�a-Serrano, P., Schnabel, I., and Garrido, J. (1986).Envinm. Techn. Lett. 7, 479?486.
3. Gil-Pe�a, M.L., Schnabel, I., and Garrido, J. (1987).International Congress on Renewable Energy Sources, in press.
4. Glanser-Soljan, M., Ban, S.N., and Dvoracek, L. (1985).Prehrambeno-Technol, Rev. 23 (1?2), 3?10.
5. Koster, I.W. and Lettinga, G. (1983). Ammonium-toxicity in anaerobic digestion. In:Proc. Europ. Symp. Anaerobic Waste Water Treatment, W.J. van den Brink, ed., p. 553, TNO Corp. Comm. Dept., The Hague, Netherlands.