@article{ARM_1969_5_1_a3,
     author = {Timm, J\"urgen},
     title = {Die {L\"osung} eines {Problems} von {Havel}},
     journal = {Archivum mathematicum},
     pages = {25--28},
     year = {1969},
     volume = {5},
     number = {1},
     mrnumber = {0277576},
     zbl = {0238.16029},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/ARM_1969_5_1_a3/}
}