(3GdcdeI hGdHfGA GdOQGej (B:s (3QDjI fbOjI JMdjdjI ebGQfI (B/s - (3GHh GdQVG ,SYO s ((3GdchjJ (B:s (3OGQ GdcJGH GdMOjK ,s, 1981)
Keywords: (3GdeSQMjI s