(3JYdje GdcHGQ heTcdGJ GdYUQ (B: s (3OQGSGJ hbVGjG (B/s - (3GdNfcGhj, EHQGgje eMeO EHQGgjes ((3GdeedcI GdYQHjI GdSYhOjI (B:s (3OGQ GdGfOdS,s, 1990)
Keywords: (3JYdje GdcHGQs; (3WQb GdJOQjS s