@article{MZ_1935__39_168549,
     author = {F. Klein},
     title = {Beitr\"age zur {Theorie} der {Verb\"ande}},
     journal = {Mathematische Zeitschrift},
     pages = {227--239},
     publisher = {mathdoc},
     volume = {39},
     year = {1935},
     zbl = {60.0092.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1935__39_168549/}
}