@article{10_21136_MB_2001_133915,
     author = {Pi\'oro, Konrad},
     title = {On subalgebra lattices of a finite unary algebra. {I.}},
     journal = {Mathematica Bohemica},
     pages = {161--170},
     publisher = {mathdoc},
     volume = {126},
     number = {1},
     year = {2001},
     doi = {10.21136/MB.2001.133915},
     mrnumber = {1826479},
     zbl = {0978.08003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.2001.133915/}
}