Laysirikul, E., 		Sawatraksa, N., & 		Namnak, C.
(2018).
 Left regular and right regular elements of the semigroups of transformations restricted by an equivalence.
<em>Naresuan University Journal: Science And Technology (NUJST), 26</em>(4), 89-93.
doi:10.14456/nujst.2018.25