?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Keyfitz%2C+N.&rft.aulast=Keyfitz&rft.aufirst=N.&rft.issue=supp&rft.volume=12&rft.date=1986&rft.issn=1728-4457&rft.atitle=The+family+that+does+not+reproduce+itself.&rft.title=Population+and+Development+Review&rft.pages=139-154&rft.genre=article