Article in a refereed journal:

Philippe Bontems, Pierre Dubois and Tomislav Vukina, "Optimal Regulation of Private Production Contracts with Environmental Externalities", Journal of Regulatory Economics, vol. 26, n. 3, September 2004, p. 287-301.

Philippe Bontems, Pierre Dubois and Tomislav Vukina, "Optimal Regulation of Private Production Contracts with Environmental Externalities", IDEI Working Paper, n. 241, 2003.