?url_ver=Z39.88-2004&rft_id=10.1080%2F08898489009525297&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Keyfitz%2C+N.&rft.aulast=Keyfitz&rft.aufirst=N.&rft.issue=2&rft.volume=2&rft.date=1990&rft.issn=0889-8480&rft.atitle=The+profile+of+Intercohort+increase&rft.title=Mathematical+Population+Studies&rft.pages=105-117&rft.genre=article