1. Rafal Ablamowicz and Bertfried Fauser. 2007. CLIFFORD: a Maple 11 Package for Clifford Algebra Computations version 11. http://math.tntech.edu/rafal/cliff11/index.html Retrieved February 28 2008 from Rafal Ablamowicz and Bertfried Fauser. 2007. CLIFFORD: a Maple 11 Package for Clifford Algebra Computations version 11. http://math.tntech.edu/rafal/cliff11/index.html Retrieved February 28 2008 from
2. The patent holder's dilemma