1. L.V. Assur, The investigation of planar rod mechanisms with lower pairs from the view of their structure and classification, Acad. USSR Publishing. 1952 (in Russ.).
2. M. Ceccarelli, Distinguished Figures in Mechanism and Machine Science: Their Contributions and Legacies, Part 3, Springer, 2007.
3. E.E. Peisakh, Classification of the planar Assur groups, J. Mech. Mach. Theory. 9 (2007) 5-17. (in Russ.).
4. L.T. Dvornikov, L.N. Gudimova, The problem of diversity searching of eight-bar planar jointed Assur groups, J. Mech. Mach. Theory. 1 (2008) 15-29. (in Russ.).
5. I.I. Artobolevski, Theory of Mechanisms and Machines, Moscow, 1965. (in Russ.).