References
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- Blacker , J. G. C. 1977 . The Estimation of Adult Mortality in Africa from Data on Orphanhood . Population Studies , 31 ( 1 ) March
- Coale , A. J. 1972 . Age Patterns of Marriage . Population Studies , 25 ( 2 )
- Brass , W. 1971 . “ On the Scale of Mortality ” . In Biological Aspects of Demography , Edited by: Brass , W. London : Taylor and Francis .