Comment on “Balance recovery control for biped robot based on reaction null space method” by Baoping Wang, Renxi Hu, Jinming Zhang and Chuangfeng Huai

Dear Editor, I am coauthor of the paper entitled "Balance control of a humanoid robot based on the reaction null space method" by Akinori Nishio, Kentaro Takahashi and Dragomir N. Nenchev, published on pages 1996 - 2001 in the Proceeding of the 2006 IEEE/RSJ International Conference on Intelligent Robots and Systems held 9-15 October 2006 in Beijing, China.