?url_ver=Z39.88-2004&rft_id=10.1007%2FBF00693017&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Klaassen%2C+G.&rft.aulast=Klaassen&rft.aufirst=G.&rft.issue=2&rft.volume=5&rft.date=March+1995&rft.issn=1573-1502&rft.atitle=Introduction&rft.title=Environmental+and+Resource+Economics&rft.pages=85-93&rft.genre=article