@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/