Article in a refereed journal:

André Grimaud and Gilles Lafforgue, "Climate Change Mitigation Policies: Are R&D Subsidies Preferable to a Carbon Tax?", Revue d'Économie Politique, vol. 119, n. 6, November 2008, p. 915-940.

André Grimaud and Gilles Lafforgue, Climate Change Mitigation Policies: Are R&D Subsidies Preferable to a Carbon Tax?, November 2008.