(3GdMGSI GdSGOSI (B:s (3OQGSI aj GdXhGgQ GdNGQbI (B/s - (3YeQGf, WGdHs ((3OeTb (B:s (3OGQ GdeYQaI,s, 1990)
Keywords: (3NhGQb GdWHjYIs; (3GdZjHjGJs