1. A characterization of sets of n points which determine n hyperplanes;Basterfield,1968
2. Graphs and Hypergraphs;Berge,1973
3. Lattice Theory;Birkhoff,1948
4. Algebraic Theory of Lattices;Crawley,1973
5. Proof of a conjecture on finite modular lattices;Dilworth;Ann. of Math.,1954