HAL-5. GOOD DESIGN AWARD. 2006-06-09 [2018-03-05]. (原始内容存档于2021-01-16). RickWallace. Robots to the rescue as an aging Japan looks for help. THE AUSTRALIAN
theory. NASA WMAP. 2006-02-16 [2007-02-27]. (原始内容存档于2020-04-27). Campbell, Wallace Hall. Introduction to Geomagnetic Fields. New York: Cambridge University