(3GdJbQjQ GdSfhj (B: s (3Y(B13 1989 / s - (3eLeY GddZI GdYQHjI GdCQOfjs ((3YeGf (B:s (3eLeY GddZI GdYQHjI GdCQOfj,s, 1989)
Keywords: (3GddZI GdYQHjIs; (3GdeLGeY GddZhjIs