(3HMK efgL GdGSdGe GdYdei ai OYhI GdQSd (B/s - (3eMeO Ydi eMLhH s ((3GdbGgQI (B:s (3OGQ GdZO GdYQHi ,s, 1997)
(3GdfU HGddZI GdYQHjIs
Keywords: (3GdTQjYI GdGSdGejIs