Farzin Mokhtarian Sadegh Abbasi Affine Curvature Scale Space with Affine Length Parametrisation. 1-8 2001 4 Pattern Anal. Appl. 1 http://www.springerlink.com/openurl.asp?genre=article&issn=1433-7541&volume=4&issue=1&spage=1 db/journals/paa/paa4.html#MokhtarianA01