(3eSJbHd GdCQOf (B: s (3GdOjehbQGWjI(B-(3GdghjI(B-(3GdJMOjGJ (B/ s - (3NhQj, WGQbs ((3YeGf (B:s, 1990)
Keywords: (3GdXQha GdSjGSjIs; (3JGQjN GdCQOfs; (3GdJGQjN GdSjGSjs; (3GdOjehbQGWjIs