@article{10_21136_CMJ_1982_101820,
     author = {Jakub{\'\i}kov\'a-Studenovsk\'a, Danica},
     title = {On congruence relations of monounary algebras. {I}},
     journal = {Czechoslovak Mathematical Journal},
     pages = {437--459},
     publisher = {mathdoc},
     volume = {32},
     number = {3},
     year = {1982},
     doi = {10.21136/CMJ.1982.101820},
     mrnumber = {669786},
     zbl = {0509.08003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1982.101820/}
}