@article{BAG_1974__3_138105,
     author = {E.T. SCHMIDT},
     title = {\"Uber die {Kongruenzrelationen} der modularen {Verb\"ande}},
     journal = {Beitr\"age zur Algebra und Geometrie},
     pages = {59--68},
     publisher = {mathdoc},
     volume = {3},
     year = {1974},
     url = {http://geodesic.mathdoc.fr/item/BAG_1974__3_138105/}
}