1. J.H. Edwards, Ann. Hum. Genet. 25, 83 (1961)
2. S.D. Walter, J.M. Elwood, Brit. J. Prev. Soc. Med. 29, 18–21 (1975)
3. A.M. Stolwijk, H. Straatman, G.A. Zielhuis, J. Epidemiol. Community Health 53, 235 (1999)
4. J.A. Nelder, R.W.M. Wedderburn, J. R. Statist. Soc. A 135(3), 370–384 (1972)
5. B.R. Kirkwood, J.A.C. Sterne. Essential Medical Statistics. (Blackwell Science, Malden). 2nd edition, (2003). ISBN: 978-0-865-42871-3