Romano, Angelo Max Planck Institute for Research on Collective Goods, Max Planck Society;
http://www.pnas.org/content/early/2018/01/08/1720651115.full?sid=71197664-c539-47ff-93a7-19caf09e1812 (Any fulltext)
Romano, A., Balliet, D., Yamagishi, T., & Liu, J. H. (2018). Reply to De Dreu: Shared partner nationality promotes ingroup favoritism in cooperation. PNAS, Proceedings of the National Academy of Sciences of the United States, 115(5), E846-E847.