Algebraically extended 2D image representation
 @InProceedings{zang06acsmace,
  author = 	 {D. Zang and G. Sommer},
  title = 	 {Algebraically extended 2D image representation},
  booktitle =	 {Proceedings (digital) of the 17th International Conference on the Applications of Computer Science and Mathematics in Architecture and Civil Engineering, IKM, Weimar},
  year =	 2006,
}