Ekkachai Laysirikul และ Nares Sawatraksa; Chaiwat Namnak. (2018) Left regular and right regular elements of the semigroups of transformations restricted by an equivalence. <i>Naresuan University Journal: Science and Technology</i>, <i>26</i>(4), 89-93.Ekkachai Laysirikul และ Nares Sawatraksa; Chaiwat Namnak. "Left regular and right regular elements of the semigroups of transformations restricted by an equivalence". Naresuan University Journal: Science and Technology 26 (2018):89-93.Ekkachai Laysirikul และ Nares Sawatraksa; Chaiwat Namnak. Left regular and right regular elements of the semigroups of transformations restricted by an equivalence. Naresuan University Graduate School:ม.ป.ท. 2018.