(3GdNdjL GdYQHj (B:s (3OQGSI aj GdLZQGajI GdGbdjejI (B/s - (3GdeHGOQ ,SGde SYOhf s ((3HZOGO(B:s (3OGQ GdMQjI ,s, 1981)
Keywords: (3GdNdjL GdYQHj s