@article{MZ_1973__133_171948,
     author = {Klaus Doerk},
     title = {Die maximale lokale {Erkl\"arung} einer ges\"attigten {Formation}},
     journal = {Mathematische Zeitschrift},
     pages = {133--136},
     year = {1973},
     volume = {133},
     zbl = {0253.20061},
     url = {http://geodesic.mathdoc.fr/item/MZ_1973__133_171948/}
}