@article{CMJ_1997__47_2_a0,
     author = {M\"uller, Edgar and Mutzbauer, Otto},
     title = {Schichtengleiche {Gewichte} und {Butlergruppen}},
     journal = {Czechoslovak Mathematical Journal},
     pages = {193--204},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1997},
     mrnumber = {1452415},
     zbl = {0931.20042},
     language = {ge},
     url = {http://geodesic.mathdoc.fr/item/CMJ_1997__47_2_a0/}
}