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	1.	On estimating the risk of conception from observations on first conceptive delays. [electronic resource] by Singh, S N Chakrabarty, K C Barman, D Producer: 19820109 In: Journal of theoretical biology vol. 90 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	A modification of a continuous time model for first conception. [electronic resource] by Singh, S N Chakrabarty, K C Singh, V K Producer: 19760510 In: Demography vol. 13 Availability: No items available. Save to lists Add to cart (remove)

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