@article{MAN_1921__82_158849,
     author = {L.E.J. Brouwer},
     title = {Aufz\"ahlung der {Abbildungsklassen} endlichfach zusammenh\"angender {Fl\"achen}},
     journal = {Mathematische Annalen},
     pages = {280--286},
     publisher = {mathdoc},
     volume = {82},
     year = {1921},
     zbl = {48.0649.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1921__82_158849/}
}