Powered bipeds based on passive dynamic principles. - Stuart O. Anderson; Martijn Wisse; Christopher G. Atkeson; Jessica K. Hodgins; Garth Zeglin; Brian Moyer (Humanoids, 2005)

Passive-Based Walking Robot. - Martijn Wisse; Guillaume Feliksdal; Jan van Frankenhuyzen; Brian Moyer (IEEE Robotics Autom. Mag., 2007)