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@article{DMGAA_2015_35_1_a1, author = {Dymek, Grzegorz}, title = {On a period of elements of {pseudo-BCI-algebras}}, journal = {Discussiones Mathematicae. General Algebra and Applications}, pages = {21--31}, publisher = {mathdoc}, volume = {35}, number = {1}, year = {2015}, language = {en}, url = {http://geodesic.mathdoc.fr/item/DMGAA_2015_35_1_a1/} }
Dymek, Grzegorz. On a period of elements of pseudo-BCI-algebras. Discussiones Mathematicae. General Algebra and Applications, Tome 35 (2015) no. 1, pp. 21-31. http://geodesic.mathdoc.fr/item/DMGAA_2015_35_1_a1/