@article{10_21136_CMJ_1979_101624,
     author = {Jakub{\'\i}kov\'a, Danica},
     title = {Systems of unary algebras with common endomorphisms. {I}},
     journal = {Czechoslovak Mathematical Journal},
     pages = {406--420},
     publisher = {mathdoc},
     volume = {29},
     number = {3},
     year = {1979},
     doi = {10.21136/CMJ.1979.101624},
     mrnumber = {536068},
     zbl = {0401.08010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1979.101624/}
}