1. Models and Ultraproducts;Bell,1969
2. D. J. Brown, Aggregation of preferences, Quart. J. Econ. (forthcoming).
3. D. J. Brown, Acyclic aggregation over finite sets of alternatives, Rev. Econ. Stud. (submitted).
4. Algebraic Theory of Lattices;Crawley,1973
5. The existence of group preferences;Hansson,1972