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2. H4: A new family of 4-DOF parallel robots;Pierrot,1999
3. I4: A new parallel mechanism for Scara motions;Krut,2003
4. Par4: Very high speed parallel robot for pick-and-place;Nabat,2005
5. Multiobjective Optimum Design of a Symmetric Parallel Schönflies-Motion Generator;Altuzarra,2009