@article{MZ_1970__116_171387,
     author = {Udo Simon and Wolfgang Wendland},
     title = {Zur {Indexmethode} in der {Differentialgeometrie} im {Gro{\ss}en.}},
     journal = {Mathematische Zeitschrift},
     pages = {242--246},
     publisher = {mathdoc},
     volume = {116},
     year = {1970},
     zbl = {0191.20001},
     url = {http://geodesic.mathdoc.fr/item/MZ_1970__116_171387/}
}