@article{10_21136_CMJ_1978_101551,
     author = {Kope\v{c}ek, Old\v{r}ich},
     title = {Existence of monomorphisms of partial unary algebras},
     journal = {Czechoslovak Mathematical Journal},
     pages = {462--473},
     publisher = {mathdoc},
     volume = {28},
     number = {3},
     year = {1978},
     doi = {10.21136/CMJ.1978.101551},
     mrnumber = {0485638},
     zbl = {0455.08007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1978.101551/}
}