@article{MZ_1958__69_169725,
     author = {Detlef Laugwitz and Kurt Schmieden},
     title = {Eine {Erweiterung} der {Infinitesimalrechnung.}},
     journal = {Mathematische Zeitschrift},
     pages = {1--39},
     publisher = {mathdoc},
     volume = {69},
     year = {1958},
     zbl = {0082.04203},
     url = {http://geodesic.mathdoc.fr/item/MZ_1958__69_169725/}
}