@article{ELMA_1967__22_140842,
     author = {H. Stachel},
     title = {Elementare {Bestimmung} der gef\"ahrlichen {Fl\"ache} beim r\"aumlichen {R\"uckw\"artsschnitt.}},
     journal = {Elemente der Mathematik},
     pages = {34--37},
     publisher = {mathdoc},
     volume = {22},
     year = {1967},
     zbl = {0144.45901},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1967__22_140842/}
}