(3eYGhd GdgOe hGdefcQGJ (B/s - (3GdMGL, NGdO eMeO Ydjs ((3GdOeGe, GdSYhOjI (B:s (3OGQ GdQGhj ddfTQ hGdJhRjY,s, 2000)
(3HHdjhLQGajI (B: (3U(B. 589-601.s
Keywords: (3GdESdGes -- (3OaY eWGYfs; (3Yde GdcdGes; (3GdCNdGb GdESdGejIs