Anucha Promwungkwa และ Paiboon Limpitipanich. (2014) Description of User-defined Material Subroutine (UMAT) in LS-DYNA for Nonlinear Solid Mechanics. Thai Society of Mechanical Engineers:ม.ป.ท.Anucha Promwungkwa และ Paiboon Limpitipanich. 2014. Description of User-defined Material Subroutine (UMAT) in LS-DYNA for Nonlinear Solid Mechanics. ม.ป.ท.:Thai Society of Mechanical Engineers;Anucha Promwungkwa และ Paiboon Limpitipanich. Description of User-defined Material Subroutine (UMAT) in LS-DYNA for Nonlinear Solid Mechanics. ม.ป.ท.:Thai Society of Mechanical Engineers, 2014. Print.