@article{ELMA_1979__34_141229,
     author = {Ingrid Mengersen},
     title = {Vierseitige {Fl\"achen} in {Geradenordnungen.}},
     journal = {Elemente der Mathematik},
     pages = {55--59},
     publisher = {mathdoc},
     volume = {34},
     year = {1979},
     zbl = {0398.51001},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1979__34_141229/}
}