@article{MOMA_1961__65_177134,
     author = {H. Schaal},
     title = {Ein {Beitrag} zur konstruktiven {Differentialgeometrie.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {265--269},
     publisher = {mathdoc},
     volume = {65},
     year = {1961},
     zbl = {0098.36802},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1961__65_177134/}
}