@article{AUPO_2010__49_2_a2,
     author = {Chajda, Ivan and L\"anger, Helmut},
     title = {Quotients and homomorphisms of relational systems},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {37--47},
     publisher = {mathdoc},
     volume = {49},
     number = {2},
     year = {2010},
     mrnumber = {2796945},
     zbl = {1241.08001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_2010__49_2_a2/}
}