@article{CMJ_2008_58_3_a3,
     author = {Demko, Milan},
     title = {On congruences and ideals of partially ordered quasigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {637--650},
     year = {2008},
     volume = {58},
     number = {3},
     mrnumber = {2455927},
     zbl = {1174.06326},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2008_58_3_a3/}
}