(3VZW GdOe GdeQJaY(B: (3CSHGHg hWQb eYGdLJgs - (3ChHQjGf(B. (3Cjhfs ((3GdCgdjI ddfTQ hGdJhRjYs (3HjQhJs, 1987)
Keywords: (3GQJaGY VZW GdOe CeQGV s