K. Bühler, P. Felkel, A. LaCruz:
"Geometric Methods for Vessel Visualization and Quantification- A Survey";
in: "Geometric Modeling for Scientific Visualization", G. Brunnett, B. Hamann, H. Müller (ed.); Springer, 2003, ISBN: 3-540-40116-4, 399 - 420.
http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04404534