(3GdWH GdQhMGfj (B/s - (3GHf GdLhRj, YHO GdQMef Hf Ydj Hf eMeO,s 508-597 (3g`(B.s; (3YGThQ, eUWais ((3GdQjGV (B:s (3ecJHI GdSGYj,s, 1987)
Keywords: (3GdJQHjI GdESdGejIs; (3GdhYX hGdEQTGOs