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@article{ARM_1987__23_4_a0, author = {Chajda, Ivan}, title = {On the one principal congruence identity}, journal = {Archivum mathematicum}, pages = {187--190}, publisher = {mathdoc}, volume = {23}, number = {4}, year = {1987}, mrnumber = {930779}, zbl = {0663.08003}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1987__23_4_a0/} }
Chajda, Ivan. On the one principal congruence identity. Archivum mathematicum, Tome 23 (1987) no. 4, pp. 187-190. http://geodesic.mathdoc.fr/item/ARM_1987__23_4_a0/