1. Note on isomorphic hypergraphs and some extensions of Whitney's theorem to families of sets;Berge;J. Combinatorial Theory Ser. B,1972
2. On equivalence of matrices under row and column permutation;Fleischer;Bell Telephone Laboratories preprint,1957
3. Isomorphismes d'hypergraphes;Fournier,1975
4. J.-L. Paillet, A threshold property for intersections in a finite set, à paraître.
5. J. A. Zimmer, non publié (1975).