Contribution to a book:

Michel Le Breton and Shlomo Weber, "Group Formation with Heterogeneous Feasible Sets", in Institutions, Equilibria and Efficiency: Essays in Honor of Birgit Grodal, chapter 16, Springer Verlag, March 2006, p. 295-315.

Michel Le Breton and Shlomo Weber, "Group Formation with Heterogeneous Sets", IDEI Working Paper, n. 288, June 2004.