@article{ARM_1978__14_1_a3,
     author = {Kope\v{c}ek, Old\v{r}ich},
     title = {Homomorphisms of machines. {I}},
     journal = {Archivum mathematicum},
     pages = {45--50},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {1978},
     mrnumber = {512743},
     zbl = {0406.68044},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1978__14_1_a3/}
}