1. Kempe, A. B.: On Conjugate Four-piece Linkages, Proc. Lond. Math. Soc.Is, Vol. 9, (1878), 133–147.
2. Darboux, G.: Recherches sur un système articulé, Bull. Sci. Math. 2s, Vol. 3, (1879), 151–192.
3. Baker, J. E.,.Yu, H. Ch.: Re-Examination of a Kempe Linkage, Mechanism and Machine Theory, Vol. 18 No. 1, (1983), 7–22.
4. You, Z., Pellegrino, S.: Foldable Bar Stuctures, Int. J. Solids and Structures„Vol. 34, (1997), 1825–1847
5. Röschel, O.: Zwangläufig bewegliche Polyedermodelle I, Math. Pannonica, 6 /1, (1995) 267–285.