András Frank, Alexander Schrijver. Vertex-Disjoint Simple Paths of Given Homotopy in a Planar Graph. In William J. Cook, Paul D. Seymour, editors, Polyhedral Combinatorics, Proceedings of a DIMACS Workshop, Morristown, New Jersey, USA, June 12-16, 1989. Volume 1 of DIMACS Series in Discrete Mathematics and Theoretical Computer Science, pages 139-162, DIMACS/AMS, 1990.
Abstract is missing.