Ulrich Weidenbacher Pierre Bayerl Roland W. Fleming Heiko Neumann Extracting and depicting the 3D shape of specular surfaces. 83-86 2005 APGV http://doi.acm.org/10.1145/1080402.1080416 conf/apgv/2005 db/conf/apgv/apgv2005.html#WeidenbacherBFN05