“…Without being complete we quote some of the papers: Shapley, Shubik (1971), Shapley, Scarf (1974), Crawford, Knoer (1981), Kaneko (1982), Kelso, Crawford (1982), Quinzii (1984), Roth (1984), Rochford (1984), Demange, Gale (1985), Crawford, Rochford (1986), and finally the excellent book of Roth and Sotomayor (1990).…”