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3. Michael Gleicher. “Integrating Contraints and Direct Manipulation”, Procs of Symposium on Interactive 3D Graphics ’92, pp. 171–174, ACM (1992)
4. Qualitative Reasoning Section 8: Computational Kinematics, Toyoaki Nishida, Asakura Books (1993)
5. Peter Schroder and David Zeltzer. “The Virtual Elector Set: Dynamic Simulation with Linear Recursive Constraint Propagation”, Procs of Symposium on Interactive 3D Graphics ’90, pp. 23–31, ACM (1990)