Songpon Sriwongsa และ Yotsanan Meemark. (2014) Orthogonal Graphs Over Finite Commutative Rings of Odd Characteristic. Chulalongkorn University:ม.ป.ท.Songpon Sriwongsa และ Yotsanan Meemark. 2014. Orthogonal Graphs Over Finite Commutative Rings of Odd Characteristic. ม.ป.ท.:Chulalongkorn University;Songpon Sriwongsa และ Yotsanan Meemark. Orthogonal Graphs Over Finite Commutative Rings of Odd Characteristic. ม.ป.ท.:Chulalongkorn University, 2014. Print.