1. Robert's Cognates of Space Four-Bar Mechanisms With Two General Constraints;Soni;ASME Paper, No. 68-Mech-22,1968
2. Spatial Motions I — Point Paths of Mechanisms With Four or Fewer Links;Primrose;ASME Paper, No. 68-Mech-12,1968
3. Design of spatial linkages to replace gears;Suh;J. Mechanisms,1970
4. Four multiply separated positions in coplanar motion;Tesar;J. of Eng. for Ind. Trans. ASME,1967
5. Four multiply separated positions in coplanar motion;Tesar;J. of Eng. for Ind. Trans. ASME,1967