Geodesic
The Classification of Maps of Nonorietable Surfaces.
Mathematische Annalen, Tome 281 (1988) no. 4, pp. 687-702.

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Mots-clés : classification of generic coverings of closed surfaces, homotopy classification of maps of positive degree between closed surfaces, first Stiefel-Whitney class 
@article{MAN_1988__281_4_164445,
     author = {David Gabai and William H. Kazez},
     title = {The {Classification} of {Maps} of {Nonorietable} {Surfaces.}},
     journal = {Mathematische Annalen},
     pages = {687--702},
     publisher = {mathdoc},
     volume = {281},
     number = {4},
     year = {1988},
     zbl = {0656.57001},
     url = {http://geodesic.mathdoc.fr/item/MAN_1988__281_4_164445/}
}
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David Gabai; William H. Kazez. The Classification of Maps of Nonorietable Surfaces.. Mathematische Annalen, Tome 281 (1988) no. 4, pp. 687-702. http://geodesic.mathdoc.fr/item/MAN_1988__281_4_164445/