1 M. H. Raibert, "Trotting, Pacing, and Bounding by a Quadruped Robot" 23 (23): 79-98, 1990
2 M. Guihard, "SAPPHYR: Legs to pull a wheel structure" 1303-1308, 1995
3 C. Ridderstrom, "Legged Locomotion: Balance, Control and Tools-from Equation to Action" 2003
4 R. Playter, "BigDog" 6230 : 2006
5 L.R. Palmer Ⅲ, "3D Control of a High-Speed Quadruped Trot" 33 (33): 298-302, 2006