Nissara Sirasuntorn และ Yupaporn Kemprasit. (2011) Left regular and right regular elements of some semigroups. Chulalongkorn University:ม.ป.ท.Nissara Sirasuntorn และ Yupaporn Kemprasit. 2011. Left regular and right regular elements of some semigroups. ม.ป.ท.:Chulalongkorn University;Nissara Sirasuntorn และ Yupaporn Kemprasit. Left regular and right regular elements of some semigroups. ม.ป.ท.:Chulalongkorn University, 2011. Print.