@article{MZ_1956__66_169630,
     author = {W. Meyer-K\"onig and Karl Zeller},
     title = {L\"uckenumkehrs\"atze und {L\"uckenperfektheit.}},
     journal = {Mathematische Zeitschrift},
     pages = {203--224},
     publisher = {mathdoc},
     volume = {66},
     year = {1956},
     zbl = {0075.25801},
     url = {http://geodesic.mathdoc.fr/item/MZ_1956__66_169630/}
}