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M.L. Berman , K. Hanson & I.L. Hellman (1972) Effect of breast-feeding on post-partum menstruation, ovulation and pregnancy in Alaskan Eskimos. Am. J. Obstet. Gynec. 114, 524.
P. Cantrelle & H. Leridon (1971) Breastfeeding, mortality in childhood and fertility in a rural zone of Senegal. Popul. Stud. 25, 505.
L. Chen , S. Ahmed , M. Gesche & W. Mosley (1974) A prospective study of birth interval dynamics in rural Bangladesh. Popul. Stud. 28, 277.
A. Chowdhury , A. Khan & L. Chen (1976) The effect of child mortality experience on subsequent fertility in Pakistan and Bangladesh. Popul. Stud. 30, 2.
A.K. Jain (1969) Pregnancy outcome and the time required for the next conception. Popul. Stud. 23, 69.
A. Jain , T. Hsu , R. Freedman & M. Chang (1970) Demographic aspects of lactation and post-partum amenorrhoea. Demography, 7, 255.
I. Kamal , F. Hefnawi , M. Ghoneim , M. Talaat , N. Younis , A. Tagui & M. Abdalla (1969) Clinical, biochemical and experimental studies on lactation. I. Lactation pattern in Egyptian women. Am. J. Obstet. Gynec. 105, 314.
A. Perez , P. Vela , R. Potter & G.S. Masnick (1971) Timing and sequence of resuming ovulation and menstruation after childbirth. Popul. Stud. 25, 491.
R.G. Potter (1963) Birth intervals: structure and change. Popul. Stud. 17, 155.
R. Rolland , R. Lequin , L. Schellekens & F. De Jong (1975) The role of prolactin in the restoration of ovarian function during the early post-partum period in the human female. I. A study during physiological lactation. Clin. Endocr. 4, 15.
M. Singarimbun & C. Manning (1976) Breastfeeding, amenorrhoea and abstinence in a Javanese village: a case study in Mojolama. Stud. Fam. Plann. 7, No. 6.
J. Van Ginneken (1974) Prolonged breastfeeding as a birth spacing method. Stud. Fam. Plann. 5, 201; J. envir. Child Hlth, 21, 59.
H. Vis , M. Bossuyt , P. Hennart & M. Carrael (1975) The health of mother and child in rural Central Africa. Stud. Fam. Plann. 6, No. 12.
J.B. Wyon & J.E. Gordon (1971) The Khanna Study: Population Problems in the Rural Punjab. Harvard University Press, Cambridge, Mass.