Sutter, Matthias Max Planck Institute for Research on Collective Goods, Max Planck Society;
https://doi.org/10.1007/s10683-007-9188-7 (Any fulltext)
Luhan, W., Kocher, M., & Sutter, M. (2009). Group polarization in the team dictator game reconsidered. Experimental Economics, 12, 26-41.