?url_ver=Z39.88-2004&rft_id=10.1111%2Fj.1749-6632.1994.tb30420.x&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Keyfitz%2C+N.&rft.aulast=Keyfitz&rft.aufirst=N.&rft.issue=1&rft.volume=709&rft.date=February+2006&rft.issn=00778923&rft.atitle=Influence+of+Human+Reproduction+on+Environmenta&rft.title=Annals+of+the+New+York+Academy+of+Sciences&rft.pages=331-346&rft.genre=article