1. Adjoints of oriented matroids;Bachem,1984
2. Adjoints of a geometry;Chéung;Canadian Math. Bul,1974
3. Oriented matroids of rank three and arrangements of pseudolines;Cordovil;Ann. Discrete Math,1983
4. Polarity and point extensions in oriented matroids;Cordovil,1984
5. On the Foundations of Combinatorial Theory: Combinatorial Geometries;Crapo,1970