1. Graphical synthesis of an adjustable 4-bar linkage;Bonnell;Design News,1972
2. A 4-bar linkage adjustable for variable straight line motions;Tao;J. Engng Ind. Trans. ASME, Series B,1965
3. Synthesis of 4-bar linkages adjustable for several approximate straight-line motions of a coupler point;Beaudrot;J. Engng Ind. Trans. ASME, Series B,1969
4. D. C. Tao and R. D. Bonnell, 4-bar linkage adjustable for constant angular velocity ratios. ASME Paper No. 68-Mech-39.
5. Linkage mechanism adjustable for variable coupler curves with cusps;Tao,1977