@article{MASLO_1987__37_2_a3,
     author = {Chajda, Ivan},
     title = {Algebras with principal tolerances},
     journal = {Mathematica slovaca},
     pages = {169--172},
     publisher = {mathdoc},
     volume = {37},
     number = {2},
     year = {1987},
     mrnumber = {899432},
     zbl = {0617.08012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1987__37_2_a3/}
}