Pongpol Ruankong และ Songkiat Sumetkijakan. (2010) A compatible norm and a generalization of the *- product for copulas. Chulalongkorn University:ม.ป.ท.Pongpol Ruankong และ Songkiat Sumetkijakan. 2010. A compatible norm and a generalization of the *- product for copulas. ม.ป.ท.:Chulalongkorn University;Pongpol Ruankong และ Songkiat Sumetkijakan. A compatible norm and a generalization of the *- product for copulas. ม.ป.ท.:Chulalongkorn University, 2010. Print.