Author/Authors :
Golkar، F. نويسنده Department of Mathematics, Shahid Chamran university of Ahvaz, Ahvaz, Iran , , Dianatifar، A. نويسنده Department of Mathematics, Shahid Chamran university of Ahvaz, Ahvaz, Iran , , Aminpour، A. M. نويسنده Department of Mathematics, Shahid Chamran university of Ahvaz, Ahvaz, Iran , , Sadeghi، M. نويسنده Department of Mathematics, Shahid Chamran university of Ahvaz, Ahvaz, Iran ,