@article{AUPO_2003__42_1_a1,
     author = {Chajda, Ivan and Zedn{\'\i}k, Josef},
     title = {Distributivity and modularity of lattices of quasiorders},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {13--18},
     publisher = {mathdoc},
     volume = {42},
     number = {1},
     year = {2003},
     mrnumber = {2056018},
     zbl = {1054.08002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_2003__42_1_a1/}
}