@article{MOMA_1949__53_176811,
     author = {H. Schaller},
     title = {Zum r\"aumlichen {R\"uckw\"artseinschneiden.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {184--186},
     publisher = {mathdoc},
     volume = {53},
     year = {1949},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1949__53_176811/}
}