@article{10_21136_CMJ_1968_100808,
     author = {Kowalski, Old\v{r}ich},
     title = {\"Uber $U${-Homomorphismen} und {Homomorphismen} der ganzen $l${-Halbgruppen} auf $l${-Halbgruppen} mit der guten {Arithmetik}},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1--15},
     year = {1968},
     volume = {18},
     number = {1},
     doi = {10.21136/CMJ.1968.100808},
     mrnumber = {0223281},
     zbl = {0155.04303},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1968.100808/}
}