@article{GDZPPN000364959, title = {Disjoint Homotopic Paths and Trees in a Planar Graph.}, journal = {Discrete \& computational geometry}, volume = {6}, year = {1991}, pages = {527-574}, zbl = {0755.05033}, url = {http://dml.mathdoc.fr/item/GDZPPN000364959} }
Schrijver, A. Disjoint Homotopic Paths and Trees in a Planar Graph.. Discrete & computational geometry, Tome 6 (1991) pp. 527-574. http://gdmltest.u-ga.fr/item/GDZPPN000364959/