Teeraphong Phongpattanacharoen. 2003. Regressive generalized transformation semigroups. Field of Study Mathematics, Chulalongkorn University;
Teeraphong Phongpattanacharoen. (2003) Regressive generalized transformation semigroups . Chulalongkorn University/Bangkok.
Teeraphong Phongpattanacharoen. Regressive generalized transformation semigroups. . Bangkok:Chulalongkorn University, 2003.
Teeraphong Phongpattanacharoen. (2003) Regressive generalized transformation semigroups . Chulalongkorn University/Bangkok.