@article{MM2_1982__39_154884,
     author = {Michael Montag},
     title = {Lokale {Untersuchungen} an {Normalkongruenzen} im {Dreidimensionalen} elliptischen {Raum.}},
     journal = {Manuscripta mathematica},
     pages = {245--252},
     publisher = {mathdoc},
     volume = {39},
     year = {1982},
     zbl = {0497.53015},
     url = {http://geodesic.mathdoc.fr/item/MM2_1982__39_154884/}
}