Winita Mora และ Yupaporn Kemprasit. (2010) Regular elements of some order-preserving transformation semigroups and generalized order-preserving transformation semigroups. Chulalongkorn University:ม.ป.ท.Winita Mora และ Yupaporn Kemprasit. 2010. Regular elements of some order-preserving transformation semigroups and generalized order-preserving transformation semigroups. ม.ป.ท.:Chulalongkorn University;Winita Mora และ Yupaporn Kemprasit. Regular elements of some order-preserving transformation semigroups and generalized order-preserving transformation semigroups. ม.ป.ท.:Chulalongkorn University, 2010. Print.