@article{ARM_1970_6_4_a2,
     author = {Stach, Kv\v{e}tomil},
     title = {Normalgruppoide einer {Kategorie}},
     journal = {Archivum mathematicum},
     pages = {213--220},
     year = {1970},
     volume = {6},
     number = {4},
     mrnumber = {0320207},
     zbl = {0242.18003},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/ARM_1970_6_4_a2/}
}