(1)The voluntary provision of a pure public good and the Montreal Protocol: behavioral and data concernsJames C. Murdoch* and Todd Sandler†

Oxf. Econ. Pap. (2009) 61 (1): 197-200. '

http://oep.oxfordjournals.org/content/61/1/197.abstract

(2)
The voluntary provision of a pure public good? Another look at CFC emissions and the Montreal ProtocoLUlrich J. Wagner Oxf. Econ. Pap. (2009) 61 (1): 183-196.
http://oep.oxfordjournals.org/content/61/1/183.abstract