1. Combinatorial Theory;Aigner,1979
2. Diagrams for modular lattices;Benson;J. Pur Appl. Algebra,1985
3. Lattice Theory;Birkhoff,1967
4. Single-element extensions of matroids;Crapo;J. Res. Nat. Bureau Standards B 69B,1965
5. Algebraic theory of lattices;Crawley,1973