Nissara Sirasuntorn และ Yupaporn Kemprasit. (2007) Multi-valued homomorphisms between some groups and hypergroups. Chulalongkorn University:ม.ป.ท.Nissara Sirasuntorn และ Yupaporn Kemprasit. 2007. Multi-valued homomorphisms between some groups and hypergroups. ม.ป.ท.:Chulalongkorn University;Nissara Sirasuntorn และ Yupaporn Kemprasit. Multi-valued homomorphisms between some groups and hypergroups. ม.ป.ท.:Chulalongkorn University, 2007. Print.