@article{AUPO_2004__43_1_a10,
     author = {Machala, Franti\v{s}ek and Slez\'ak, Vladim{\'\i}r},
     title = {Join-closed and meet-closed subsets in complete lattices},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {113--117},
     publisher = {mathdoc},
     volume = {43},
     number = {1},
     year = {2004},
     mrnumber = {2124608},
     zbl = {1085.06003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_2004__43_1_a10/}
}