1. Principles of Mechanism;Willis,1870
2. Linear-graph representation of multi-terminal elements;Koenig,1958
3. A unified criterion for the degree of constraint of plane kinematic chains;Paul;J. Appl. Mech.,1960
4. Kinematic Synthesis of Linkages;Hartenberg,1961
5. Electromechanical System Theory;Koenig,1961