1. Wismans J, Veldpaus F, Janssen J, Huson A, and Struben P. 1980, A three-dimensional mathematical model of the knee-joint. J.Biomech. 13, 677–685.
2. Dortmans L, Sauren A, Veldpaus F, Huson A. 1984. A simplified quasi-static model of the human knee-joint based on a general two-body-system theory. 4th Meeting European Society of Biomechanics, Davos, Switzerland.
3. De Lange A, van Dijk R, Huiskes R, Selvik G, and van Rens ThJG. 1982. The application of Roentgenstereophotogrammetry for evaluation of knee-joint kinematics in vitro. In: Biomechanics: Principles and Applications (R Huiskes et al, Eds) Martinus Nijhoff Publ, 177–184.
4. Goldstein H. 1959. Classical Mechanics. Addison-Verlag, Reading, M.A.
5. Mikhail EM. 1976. Observations and Least Squares. New York, IEP-1 Dun-Donnelley.