(3GdYdGbGJ GdYHGSjI GdHjRfWjI (B132-247(3g(B/750-861(3e(B:s (3OQGSI SjGSjI MVGQjI (B/s - (3fhQj ,ehab SGde s ((3HZOGO(B:s (3OGQ GdTDhf GdKbGajI GdYGeI ,s, 1990)
Keywords: (3GdYGde GdYQHj (B-(3JGQjN(B-(3GdYUQ GdYHGSj s