1. Untersuchungen �ber die Wirkungsweise der Lactulose (?-Galactosido-Fructose) im Darm
2. . Cathartic properties of lactulose. In: , eds. Hepatic encephalopathy: management with lactulose and related carbohydrates. East Lansing, MI: Medi-Ed Press, 1988; 303–313.
3. , . Nitrogen metabolism in the gut. In: , eds. Hepatic encephalopathy: management with lactulose and related carbohydrates. East Lansing, MI: Medi-Ed Press, 1988; 31–39.