@article{CMUC_1979__20_4_a13,
     author = {Duda, Jarom{\'\i}r},
     title = {Mal'cev conditions for congruence-regular and congruence-permutable varieties},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     publisher = {mathdoc},
     volume = {20},
     number = {4},
     year = {1979},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1979__20_4_a13/}
}