1. Selective reduction - medical aspects;Howie, P.W.,1990
2. Voluntary Licensing Authority for Human 'In-Vitro' Fertilisation and Embryology. Third report,1988
3. British Broadcasting Support Services;factsheet,1995
4. Complications of ovulation induction;Ron-el, R.;International Practice and Research; Ovulation induction: the difficult patient. Balliere's Clinical Obstetrics and Gynaecology,1993
5. Three, four and more: a study of triplet and higher order births;Botting, B.J.,1990