@article{CMJ_1997__47_1_a13,
     author = {Chajda, Ivan and Duda, Jarom{\'\i}r},
     title = {Compact universal relation in varieties with constants},
     journal = {Czechoslovak Mathematical Journal},
     pages = {173--178},
     publisher = {mathdoc},
     volume = {47},
     number = {1},
     year = {1997},
     mrnumber = {1435615},
     zbl = {0897.08007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_1997__47_1_a13/}
}