@article{1195515184, author = {Nagy, Attila}, title = {On $n$-unitary subsemigroups of semigroups}, journal = {Proc. Japan Acad. Ser. A Math. Sci.}, volume = {60}, number = {1}, year = {1984}, pages = { 101-104}, language = {en}, url = {http://dml.mathdoc.fr/item/1195515184} }
Nagy, Attila. On $n$-unitary subsemigroups of semigroups. Proc. Japan Acad. Ser. A Math. Sci., Tome 60 (1984) no. 1, pp. 101-104. http://gdmltest.u-ga.fr/item/1195515184/