@article{PM_1996_1996_1_a18,
     author = {McCool, James},
     title = {La generaci\'on del grupo de clases de mapeos. {Un} estudio algebraico.},
     journal = {Publicacions matem\`atiques},
     pages = {457-468},
     publisher = {mathdoc},
     volume = {40},
     number = {2},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_1996_1996_1_a18/}
}