@article{CMH_1973__48_139539,
     author = {Helmut Groemer},
     title = {\"Uber einige {Invarianzeigenschaften} der {Eulerschen} {Charakteristik}},
     journal = {Commentarii mathematici Helvetici},
     pages = {87--99},
     publisher = {mathdoc},
     volume = {48},
     year = {1973},
     zbl = {0258.53063},
     url = {http://geodesic.mathdoc.fr/item/CMH_1973__48_139539/}
}