1. On sticky matroids;Bachem,1985
2. Separation theorems for oriented matroids;Bachem,1985
3. Adjoints of a geometry;Cheung;Canad. Math. Bull.,1974
4. Oriented matroids of rank three and arrangements of pseudolines;Cordovil;Ann. Discrete Math.,1983
5. On the foundations of combinatorial theory;Crapo,1970