(3GdfGQ (B/ s - (3eWdb, CdHjQs ((3HjQhJ (B:s (3ecJHI dHfGf,s, 1997)
Keywords: (3GdMQGQIs; (3GdhbhOs; (3GdfGQs; (3GWaGd eQMdg eJhSWg (B(6-9) (3SfhGJs