1. Gogu, G., Mobility of mechanism: A critical review, Mech. Mach. Theory 40, 1068-1097 (2005).
2. Lerbet, J., Analytic geometry and singularities of mechanisms, ZAMM, Z. angew. Math. Mech. 78(10b), 687-694 (1999).
3. Maisser, P., Differential geometric methods in multibody system dynamics, Nonlinear Ana-lysis, Theory, Methods & App. 30(8), 5127-5133 (1997).
4. Müller, A., Singuläre Phänomene in der Kinematik von Starrkörpermechanismen, Shaker Ver-lag (2004).
5. Müller, A., Geometric characterization of the configuration space of rigid body mechanisms in regular and singular points, ASME International Design Engineering Technical Conferences, September 22-28, Long Beach, California, USA (2005).