005740000a22001810004500003000900000005001700009700001900026700001700045700002300062710009500085245004800180264004100228490004300269300001000312041000800322650003000330650003200360PH-MaWHO20241108112141.01 aZatuchni, G.I.1 aLabbok, M.H.1 aSciarra, J.J.eed.  aInternational Workshop on Research Frontiers in Fertility Regulation (1980 : Mexico City).0 aResearch frontiers in fertility regulation.  aCambridge : bHarper and Row,c1980.  a(PARFR series on fertility regulation)  a459p.  aeng  aContraceptionxCongresses  aFamily planningxCongresses