(3GdcJH GdebOSI aj ejRGf GdJhKjb (B/ s - (3Whjdg, YHO GdhgGH YHO GdSdGes ((3GdbGgQg (B:s (3OGQ GdSdGe ddWHGYg,s, 1990)
Keywords: (3GdOjGfGJ GdebGQfIs; (3GdbQBf GdcQjes; (3GdEfLjds