(3bGehS YHQi YQHi ddZI GdYHQjI GdeYGUQI (B/s - (3OGajO SLjas ((3GSQGFjd (B:s (3OGQ Thcf ddfTQ ,s, 1990)
Keywords: (3GddZI GdYHQjI s; (3GddZI GdYHQjI GdeYGUQI s