@TECHREPORT{Luengo2003d,
  author = {Luengo Hendriks, C. L. and van Ginkel, M. and van Vliet, L. J.},
  title = {Underestimation of the Radius in the {Radon} Transform for Circles and Spheres},
  institution = {Pattern Recognition Group, Delft University of Technology},
  year = {2003},
  number = {PH-2003-02},
  url = {http://www.qi.tnw.tudelft.nl/Publications/reports.html}
}