1. Benjamin AM (1982) Ammonia. In: Lajtha A (ed) Handbook of neurochemistry, vol 3. Plenum Press, New York, p 117
2. Cavanagh JB, Kyu MH (1971) On the mechanism of type I Alzheimer abnormality in the nuclei of astrocytes. J Neurol Sci 12:241–261
3. Conn DO, Lieberthal MM (1979) The hepatic coma syndromes and lactulose. Williams and Williams, Baltimore
4. Diemer NH, Laursen H (1977) Glial cell reaction in rats with hyperammonemia induced by urease or porto-caval anastomosis. Acta Neurol Scand 32:123–126
5. Duffy TE, Plum F (1982) Hepatic encephalopathy. In: Arias I, Popper H, Schachter D, Shafritz DA (eds) The liver: Biology and Pathobiology. Raven Press, New York, p 693