1. Giddens, A. The Third Way: The renewal of social democracy (Polity Press, Cambridge, 1998).
2. Weber, E. Uber den Mechanismus der Einsaugung des Speisesaftes beim Menschen und bei einigen tieren. Physiol. Wissenschaftliche Med. Archiv Anat. 400–402 (1847).
3. Ferguson, A. Intraepithelial lymphocytes of the small intestine. Gut 18, 921–937 (1977).
4. Ernst, P., Befus, A. & Bienenstock, J. Leukocytes in the intestinal epithelium: an unusual immunological compartment. Immunol. Today 6, 50–55 (1985).
5. Klein, J. & Moseley, R. in Mucosal Immunology: Intraepithelial lymphocytes, advances in host defense mechanisms (eds Kiyono, H. & McGhee, J.) 33–60 (Raven Press, New York, 1993).