@article{MASLO_2006_56_3_a1,
     author = {Pi\'oro, Konrad},
     title = {On some unary algebras and their subalgebra lattices},
     journal = {Mathematica slovaca},
     pages = {255--273},
     year = {2006},
     volume = {56},
     number = {3},
     mrnumber = {2250078},
     zbl = {1141.08004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_2006_56_3_a1/}
}