@article{CMJ_1997__47_4_a9,
     author = {Jakub{\'\i}kov\'a-Studenovsk\'a, Danica},
     title = {Retract varieties of monounary algebras},
     journal = {Czechoslovak Mathematical Journal},
     pages = {701--716},
     publisher = {mathdoc},
     volume = {47},
     number = {4},
     year = {1997},
     mrnumber = {1479314},
     zbl = {0897.08006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_1997__47_4_a9/}
}