'R. 'B. Ya'º'¾'²'»'µ'² '² Ñ�'²'¾'µ'¹ '»'°'±'¾Ñ€'°Ñ‚'¾Ñ€'¸'¸ '½'° Ñ„'¸'·'¸ch'µÑ�'º'¾'¼ Ñ„'°'ºÑƒ'»ÑŒÑ‚'µÑ‚'µ 'a'I'p (1998)