(3eXGgQ ef GdMVGQI hGdeYJbO aj GdTYQ GdLGgdj (B/ s - (3GHh Shjde , GfhQ s ((3YeGf (B: s (3OGQ YeGQ , s, 1991)
Keywords: (3GdTYQ GdYQHj s -- (3JGQjN s -- (3GdYUQ GdLGgdj s