On the Behavioural Relevance of Optional and Mandatory Impure Public Goods
Dirk Engelmann, Alistair Munro, Marieta Valente
Journal Of Economic Psychology, vol. 61, 2017, p. 134-144.

Green Goods: Are They Good or Bad News for the Environment? Evidence from a Laboratory Experiment on Impure Public Goods
Alistair Munro, Marieta Valente
Environmental and Resource Economics, vol. 65, 2016, p. 317-335.