1. Screw Systems in Spatial Kinematics;Hunt,1970
2. The Mobility of Linkages;Waldron,1969
3. The Use of Motors in Spatial Kinematics;Waldron,1973
4. Mobility Analyses of Spatial Linkages;Baker,1975
5. Symmetric overconstrained linkages;Waldron;J. Engng Ind.,1969