@article{10_21136_CMJ_1984_101951,
     author = {Zelinka, Bohdan},
     title = {Tolerances on monounary algebras},
     journal = {Czechoslovak Mathematical Journal},
     pages = {298--304},
     year = {1984},
     volume = {34},
     number = {2},
     doi = {10.21136/CMJ.1984.101951},
     mrnumber = {743493},
     zbl = {0546.08001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1984.101951/}
}