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http://dx.doi.org/10.1007/s10958-008-9132-1
[6] Diasamidze, Ya. and Bakuridze, Al. (2015) On Some Properties of Regular Elements of Complete Semigroups Defined by Semilaices of the Class Σ4(x,8) International Journal of Engineering Science and Innovative Technology (IJESIT), 4, 8-15.