@article{CMUC_1980__21_1_a0,
     author = {Duda, Jarom{\'\i}r},
     title = {Congruences generated by filters},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {1--9},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1980},
     mrnumber = {566237},
     zbl = {0411.06005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1980__21_1_a0/}
}