@article{AUPO_2009__48_1_a12,
     author = {Sn\'a\v{s}el, V\'aclav and Jukl, Marek},
     title = {Congruences in ordered sets and {LU} compatible equivalences},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {153--156},
     publisher = {mathdoc},
     volume = {48},
     number = {1},
     year = {2009},
     mrnumber = {2641955},
     zbl = {1203.06001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_2009__48_1_a12/}
}