共 10 条
[6]
MISHELL D R JR, 1974, Clinical Obstetrics and Gynecology, V17, P35, DOI 10.1097/00003081-197403000-00007
[7]
TATUM HJ, 1977, FERTIL STERIL, V28, P407
[8]
VESSEY M, 1976, Journal of Biosocial Science, V8, P373
[9]
1975, OFFICIAL STATISTICS
[10]
1974, OFFICIAL STATISTIC 3