@article {hahn_environmental_2003, title = {Environmental Regulation in the 1990s: A Retrospective Analysis}, journal = {Harvard Environmental Law Review}, volume = {27}, year = {2003}, note = {A-37}, pages = {377{\textendash}415}, url = {http://heinonline.org/HOL/Page?handle=hein.journals/helr27\&id=383\&div=\&collection=journals}, author = {Hahn, Robert W. and Olmstead, Sheila M. and Robert N. Stavins} }