@article{MAN_1977__231_163051,
     author = {J\"urgen F. Kraus},
     title = {Mayer-Vietoris {Prinzip} f\"ur {Cofaserungen.}},
     journal = {Mathematische Annalen},
     pages = {47--54},
     publisher = {mathdoc},
     volume = {231},
     year = {1977},
     zbl = {0341.55007},
     url = {http://geodesic.mathdoc.fr/item/MAN_1977__231_163051/}
}