3) Z. Vafa and S. Dubowsky: Minimization of Spacecraft Disturbances in Space Robotic Systems, AAS Paper 88-006 (1988)
4) D. Nenchev, K. Yoshida and Y. Umetani: Introduction of Redundant Manipulator Arms for Manipulation in Space, Proc. of IEEE Int. Workshop on Intelligent Robots and Systems, 679/684 (1988)