The structure multivector
@InProceedings{felsberg01agacse,
  author = 	 {M. Felsberg and G. Sommer},
  title = 	 {The structure multivector},
  booktitle = 	 {Applications of Geometric Algebra in Computer Science and Engineering},
  organization = {Proc. AGACSE 2001, Cambridge, UK},
  publisher =     {Birkh{"a}user Boston},
  year =	 2002,
  editor =	 {L. Dorst and C. Doran and J. Lasenby},
  chapter =	 38,
  pages =	 {437-448,
  }