(3jG CeI GdESdGe (B: s (3TYQ (B/ s - (3GdYTeGhj, YHO GdQMef UGdMs ((3GdQjGV (B:s (3ecJHI GdYHjcGf,s, 1991)
Keywords: (3GdTYQ GdYQHjs; (3GdYUQ GdMOjKs; (3GdSYhOjIs