@article{IM_1987__90_143508,
     author = {D. Gabai and W.H. Kazez},
     title = {The classiflcation of maps of surfaces.},
     journal = {Inventiones mathematicae},
     pages = {219--242},
     publisher = {mathdoc},
     volume = {90},
     year = {1987},
     zbl = {0633.57002},
     url = {http://geodesic.mathdoc.fr/item/IM_1987__90_143508/}
}