P. Göbel, A. N. Belbachir:
"Blind Background Substraction in Dental Panoramic X-ray Images: An Application Approach";
in: "Proc. of the 27th DAGM Symposium", W. Kropatsch, R. Sablatnig, A. Hanbury (ed.); Springer, LNCS, Berlin Heidelberg, New York, 2005, 434 - 441.
http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05936554