(3GdejKhdhLjG YfO GdYQH (B:s (3OQGSI deLehYI ef GdGSGWjQ h GdeYJbOGJ GdYQHjI GdbOjeI (B/s - (3eQJGV , YHO GdeGdc s ((3GdLRGFQ (B:s (3GdeDSSI GdhWfjI ddcJGH ,s, 1989)
Keywords: (3GdeYJbOGJ s; (3GdGSGWjQ s; (3GdYQH s; (3GdejKhdhLjG s