@article{bwmeta1.element.bwnjournal-article-smv73i1p11bwm,
author = {Maciej Wojtkowski},
title = {Geodesics on open surfaces containing horns},
journal = {Studia Mathematica},
volume = {72},
year = {1982},
pages = {115-151},
zbl = {0499.58026},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv73i1p11bwm}
}
Wojtkowski, Maciej. Geodesics on open surfaces containing horns. Studia Mathematica, Tome 72 (1982) pp. 115-151. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv73i1p11bwm/