@article{CMH_1941__14_138779,
     author = {Werner Gysin},
     title = {Zur {Homologietheorie} der {Abbildungen} und {Faserungen} von {Mannigfaltigkeiten.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {61--122},
     publisher = {mathdoc},
     volume = {14},
     year = {1941},
     zbl = {0026.27003},
     url = {http://geodesic.mathdoc.fr/item/CMH_1941__14_138779/}
}