(3GdhMOI GdYQHjI JLGQHgG hJhbYGJgG (B/s ((3HjQhJ (B:s (3eQcR OQGSGJ GdhMOI GdYQHjI ,s, 1989)
Keywords: (3GdYGde GdYQHj (B-(3JGQjN s