Sven Utcke Andrew Zisserman Projective Reconstruction of Surfaces of Revolution. 265-272 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2781&spage=265 2003 conf/dagm/2003 DAGM-Symposium db/conf/dagm/dagm2003.html#UtckeZ03