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@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/} }
Chajda, Ivan. Algebras with principal tolerances. Mathematica slovaca, Tome 37 (1987) no. 2, pp. 169-172. http://geodesic.mathdoc.fr/item/MASLO_1987__37_2_a3/