The long-line graph of a combinatorial geometry. II. Geometries representable over two fields of different characteristics.

Joseph P. S. Kung The long-line graph of a combinatorial geometry. II. Geometries representable over two fields of different characteristics. 41-53 1990 50 J. Comb. Theory, Ser. B 1 http://dx.doi.org/10.1016/0095-8956(90)90095-H db/journals/jct/jctb50.html#Kung90