(1)A Tale of Two Collectives: Sulphur versus Nitrogen Oxides Emission Reduction in Europe
James C. Murdoch1, Tod Sandler2, Keith Sargent2
EconomicaVolume 64, Issue 254, pages 281–301, May 1997


http://onlinelibrary.wiley.com/doi/10.1111/1468-0335.00078/abstract
(2)
The Design of Stable International Environmental Agreements: Economic Theory and Political EconomyUlrich J. Wagner
Journal of Economic SurveysVolume 15, Issue 3, pages 377–411, July 2001


http://onlinelibrary.wiley.com/doi/10.1111/1467-6419.00143/abstract