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@article{MASLO_2003__53_3_a2, author = {Chajda, Ivan and Cz\'edli, G\'abor and Horv\'ath, Eszter K.}, title = {Trapezoid lemma and congruence distributivity}, journal = {Mathematica slovaca}, pages = {247--253}, publisher = {mathdoc}, volume = {53}, number = {3}, year = {2003}, mrnumber = {2025021}, zbl = {1058.08007}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_2003__53_3_a2/} }
Chajda, Ivan; Czédli, Gábor; Horváth, Eszter K. Trapezoid lemma and congruence distributivity. Mathematica slovaca, Tome 53 (2003) no. 3, pp. 247-253. http://geodesic.mathdoc.fr/item/MASLO_2003__53_3_a2/