@article{MZ_1956__66_169624,
     author = {Walter Nef},
     title = {\"Uber die {Fortsetzung} monotoner {Linearformen.}},
     journal = {Mathematische Zeitschrift},
     pages = {129--142},
     publisher = {mathdoc},
     volume = {66},
     year = {1956},
     zbl = {0073.08801},
     url = {http://geodesic.mathdoc.fr/item/MZ_1956__66_169624/}
}