@article{ARM_1965_1_4_a1,
     author = {Havel, V\'aclav},
     title = {Uniongraph der {Familie} von {Zerlegungen} in einer {Menge}},
     journal = {Archivum mathematicum},
     pages = {217--220},
     year = {1965},
     volume = {1},
     number = {4},
     mrnumber = {0194347},
     zbl = {0192.04803},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/ARM_1965_1_4_a1/}
}