Yoshio Tanaka, Hiroshi KawakamiandKen'ichi Fujimoto : Nonlinear Phenomena Observed in a Manipulator with a Passive Joint, Proc. of NOLTA'97, Vol.1, (号), 49-52, Honolulu, Dec. 1997.
Ken'ichi Fujimoto, Yoshio TanakaandHiroshi Kawakami : Control of Unstable Periodic Motion on a Two-Link Planer UAM, Proc. of NOLTA2000, Vol.2, (号), 425-428, Dresden, Sep. 2000.
Yoshio Tanaka, Hiroshi KawakamiandKen'ichi Fujimoto : Utilizing Chaos for Selective Swing-up of a Parallel-type Double Inverted Pendulum, Proc. of NOLTA2000, Vol.2, (号), 539-542, Dresden, Sep. 2000.
Kudo Hiroaki, Ken'ichi Fujimoto, Yoshio TanakaandHiroshi Kawakami : Stabilizing Methods of an Unstable Periodic Oscillation in an Inverted Pendulum, Proc. of NOLTA2000, Vol.2, (号), 429-432, Dresden, Sep. 2000.