The twist representation of free-form objects
 @InCollection{sommer04kluwer,
  author = 	 {G. Sommer and B. Rosenhahn and C. Perwass},
  title = 	 {The twist representation of free-form objects},
  booktitle = 	 {Geometric Properties from Incomplete Data},
  pages =	 {3-22},
  publisher =	 {Springer-Verlag},
series = {Computational Imaging and Vision},
volume = {31},
  year =	 2006
  editor =	 {R. Klette and R. Kozera and L. Noakes and J. Weickert}
}