(3EYGfI GdeJYGdj dQO cjO GdZRGdj (B/s - (3GdMejO, YHO GdcQje Hf UGdMs ((3GdQjGV (B- (3GdeedcI GdYQHjI GdSYhOjI (B:s (3OGQ GdQGjI ddfTQ hGdJhRjY ,s, 1990)
Keywords: (3GdZRGdj , eMeOs; (3GdESdGes -- (3OaY eWGYfs