@article{GDZPPN00233156X,
title = {The Classification of Maps of Nonorietable Surfaces.},
journal = {Mathematische Annalen},
volume = {280},
year = {1988},
pages = {687-702},
zbl = {0656.57001},
url = {http://dml.mathdoc.fr/item/GDZPPN00233156X}
}
Gabai, David; Kazez, William H. The Classification of Maps of Nonorietable Surfaces.. Mathematische Annalen, Tome 280 (1988) pp. 687-702. http://gdmltest.u-ga.fr/item/GDZPPN00233156X/