1. On conjugate four-piece linkages;Kempe,1878
2. Die Brennpunktmechanismen;Burmester;Z. Math. Phys.,1893
3. On Burmester's focal mechanism and Hart's straight-line motion;Wunderlich;J. of Mechanisms,1968
4. On some cases of parallel motion;Hart,1877
5. How to compose mechanisms with parallel moving bars (with application on a level-luffing jib-crane consisting of a four-bar linkage and exploiting a coupler-point curve);Dijksman;De Ingenieur,1970