(3GdOaJQ GdHQj dCYTGH GdHMQ (B: s (3fUhU TYQjI (B/ s - (3UbhQ, HOjYs ((3GddGPbjI (B:s (3OGQ GdMhGQ ddfTQ h GdJhRjY,s, 1980)
Keywords: (3GdTYQ GdYQHjs; (3GdYUQ GdMOjKs; (3ShQjIs