1. Cederloff, F.R., Friberg, L., Jonsson, E., Kaij, L.: Studies of similarity diagnosis in twins with the aid of marked questionnaires. Acta genet, statist, med. 11, 338 (1961)
2. Cudworth, A.G., Woodrow, J. C.: HL-A antigens and diabetes mellitus. Lancet II, 1153 (1974)
3. Gamble, D.R., Taylor, K.W., Cumming, H.: Coxsackie viruses and diabetes mellitus. Brit. Med. J. 4, 260 (1973)
4. Gottlieb, M.S., Root, H.F.: Diabetes mellitus in twins. Diabetes 17, 693 (1968)
5. Harvald, B.: Genetic perspectives in diabetes mellitus. Acta Medica Scand. 476, 17 (1967)