(3HfGA GdecGfR h JWhjQgG (B/ s - (3LGeYI GdOhd GdYQHjI , eQcR GdJhKjb h GdeYdheGJs ((3JhfS (B:s (3GdeQcR,s, 1987)
Keywords: (3GdecGfRs; (3GdagQSI GdehVhYjIs