https://ja.wikipedia.org/wiki/%E3%82%A4%E3%82%AE%E3%83%AA%E3%82%B9%E3%81%AE%E5%8C%BB%E7%99%82#%E5%8C%BB%E7%99%82%E6%8A%80%E8%A1%93%E8%A9%95%E4%BE%A1
https://ja.wikipedia.org/wiki/%E3%82%A4%E3%82%AE%E3%83%AA%E3%82%B9%E3%81%AE%E5%8C%BB%E7%99%82#%E5%8C%BB%E7%99%82%E6%8A%80%E8%A1%93%E8%A9%95%E4%BE%A1
