1. [1] ナブテスコ(株):C-MAX, http://welfare.nabtesco.com/kd.htm, 2008.
2. [2] 柳原,管沢,鈴木,池田,金海:“車輪付き回転十字アームを用いた階段昇降車椅子の力学解析”,第17回日本ロボット学会学術講演会予稿集,pp.1176–1177, 1999.
3. Development of Stair Climbing Wheelchair Using Crawl-Type Mechanism
4. The Method of Step Climbing Using a Wheeled Robot and a Wheelchair
5. [5] Dane Technologies, Inc.: LEVO, http://www.levousa.com/company.html, 2008.