(3JWhQ GdJfXje GdbGfhfj GdRQGYj aj GdLRGFQ (B/s - (3UOhb , YeQ s ((3GdLRGFQ (B:s (3OjhGf GdeWHhYGJ GdLGeYjI ,s, 1988)
Keywords: (3GdbGfhfj s; (3GdJfXjes; (3GdLRGFQ s; (3GdRQGYjs