Montakarn Petapirak และ Paisan Nakmahachalasint. (2008) Generalized Hyers-Ulam-Rassias stability of a pentic functional equation. Chulalongkorn University:ม.ป.ท.Montakarn Petapirak และ Paisan Nakmahachalasint. 2008. Generalized Hyers-Ulam-Rassias stability of a pentic functional equation. ม.ป.ท.:Chulalongkorn University;Montakarn Petapirak และ Paisan Nakmahachalasint. Generalized Hyers-Ulam-Rassias stability of a pentic functional equation. ม.ป.ท.:Chulalongkorn University, 2008. Print.