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@article{SF_1980__21_134455, author = {K. Todorov}, title = {On the orders of the subsemigroups of the symmetrical semigroup {Jn.}}, journal = {Semigroup forum}, pages = {329--336}, publisher = {mathdoc}, volume = {21}, year = {1980}, zbl = {0458.20059}, url = {http://geodesic.mathdoc.fr/item/SF_1980__21_134455/} }
K. Todorov. On the orders of the subsemigroups of the symmetrical semigroup Jn.. Semigroup forum, Tome 21 (1980), pp. 329-336. http://geodesic.mathdoc.fr/item/SF_1980__21_134455/