Neutral Elements, Fundamental Relations and n-Ary hypersemigroups.

Bijan Davvaz Wieslaw A. Dudek S. Mirvakili Neutral Elements, Fundamental Relations and n-Ary hypersemigroups. 567-583 2009 19 IJAC 4 http://dx.doi.org/10.1142/S0218196709005226 db/journals/ijac/ijac19.html#DavvazDM09