@article{MZ_1981__178_173116,
     author = {Hubert Flenner},
     title = {Ein {Kriterium} f\"ur die {Offenheit} der {Versalit\"at.}},
     journal = {Mathematische Zeitschrift},
     pages = {449--474},
     publisher = {mathdoc},
     volume = {178},
     year = {1981},
     zbl = {0453.14002},
     url = {http://geodesic.mathdoc.fr/item/MZ_1981__178_173116/}
}