@article{CMUC_1978__19_1_a8,
     author = {P\'alfy, P\'eter P\'al},
     title = {On certain congruence lattices of finite unary algebras},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {89--95},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {1978},
     mrnumber = {0472656},
     zbl = {0382.06007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1978__19_1_a8/}
}