Schram, A. and Onderstal, S. (2009). Bidding to give: an experimental comparison of auctions for charity International Economic Review, 50(2):431--457.
Offerman, T., Sonnemans, J., van de Kuilen, G. and Wakker, P. (2009). A Truth-Serum for Non-Bayesians: Correcting Proper Scoring Rules for Risk Attitudes Review of Economic Studies, 76(4):1461--1489.
Gillet, J., Schram, A. and Sonnemans, J. (2009). The tragedy of the commons revisited: the Importance of group decision-making Journal of Public Economics, 93(5-6):785--797.