(3OSJhQ OhdI GdEeGQGJ GdYQHjI GdeJMOI (B: s (3GddGFMI GdOGNdjI ddeLdS GdhWfj GdGJMGOj hGdfXGe GdOGNdj ddTYHI GdHQdeGfjI (B/ s ((3CHhXHj (B: s (3GdeLdS GdhWfj GdGJMGOj , s, 2000)
Keywords: (3GdOSJhQ, GdbGfhf GdYGe, GdEeGQGJ GdYQHjI GdeJMOIs