共 27 条
[1]
BILLINGS EL, 1982, BILLINGS METHOD
[2]
Bongaarts J., 1983, FERTILITY BIOL BEHAV
[3]
Brown J B, 1985, J Biosoc Sci Suppl, V9, P5
[4]
Buchanan R, 1975, Popul Rep J, P49
[5]
CRONIN TJ, 1968, LANCET, V2, P422
[6]
FLYNN AM, 1984, MANUAL NATURAL FAMIL
[8]
Gross B A, 1985, J Biosoc Sci Suppl, V9, P25
[10]
GROSS BA, 1981, INT J FERTIL, V26, P209