(3GdEHd GdYQHjI GdCUdjI (B/ s - (3GdMJj, MfG fUQs ((3WQGHdS (B((3dHfGf (B:s (3LQhS HQS,s, 1990)
Keywords: (3GdCHds; (3GdLeGd hMjOI GdSfGes; (3GdHdOGf GdYQHjIs; (3GdJGQjN GdESdGejs