Pongsan Prakitsri และ Sureeporn Chaopraknoi. (2010) Nearring structure of variants of some transformation semigroups. Chulalongkorn University:ม.ป.ท.Pongsan Prakitsri และ Sureeporn Chaopraknoi. 2010. Nearring structure of variants of some transformation semigroups. ม.ป.ท.:Chulalongkorn University;Pongsan Prakitsri และ Sureeporn Chaopraknoi. Nearring structure of variants of some transformation semigroups. ม.ป.ท.:Chulalongkorn University, 2010. Print.