Thanawit Jeeruphan และ Nataphan Kitisin. (2008) Mathematical Analysis of Marginal Investment Systems. Chulalongkorn University:ม.ป.ท.Thanawit Jeeruphan และ Nataphan Kitisin. 2008. Mathematical Analysis of Marginal Investment Systems. ม.ป.ท.:Chulalongkorn University;Thanawit Jeeruphan และ Nataphan Kitisin. Mathematical Analysis of Marginal Investment Systems. ม.ป.ท.:Chulalongkorn University, 2008. Print.