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2. On the Foundations of Combinatorial Theory: Combinatorial Geometries;Crapo,1970
3. Finite Geometries;Dembowski,1968
4. A class of geometric lattices based on finite groups;Dowling;J. Combin. Theory Ser. B,1973
5. Varieties of combinatorial geometries;Kahn;Trans. Amer. Math. Soc.,1982