Share  Bookmark

 Download from



 Funded by

1. D. Bokal, R. B. Richter and G. Salazar, Characterization of 2crossingcritical graphs I: Low connectivity or no V2n minor, manuscript, October 17, 2009.
2. G. Ding, B. Oporowski, R. Thomas and D. Vertigan, Large 4connected nonplanar graphs, manuscript, August 1999.
Baltimore, MD, 2001.
3. B. Mohar and C. Thomassen, Graphs on surfaces, Johns Hopkins University Press,
4. B. Oporowski, J. Oxley and R. Thomas, Typical subgraphs of 3 and 4connected graphs, J. Combin. Theory Ser. B 57 (1993), 239257.
5. N. Robertson and P. D. Seymour, Graph Minors IX. Disjoint crossed paths, J. Combin. Theory Ser. B 49 (1990), 4077.
6. N. Robertson, P. D. Seymour and R. Thomas, Nonplanar extensions of planar graphs, manuscript.