(3OQGSGJ aj GdJQhjM (B: s (3eQGcR GdTHGH (B/ s - (3eMeO, JgGfj YHO GdSdGes; (3Wg, Wg YHO GdQMjes ((3GdbGgQg (B:s (3OGQ GdeYGQa,s, 1991)
Keywords: (3GdJQajgs; (3GdaQGZs