title: using sets of feature vectors for similarity search on voxelized cad objects. authors: martin pfeifle , hans-peter kriegel , stefan brecheisen , peer kröger , matthias schubert. venue: sigmod conference. year: 2003
title: using extended feature objects for partial similarity retrieval. authors: stefan berchtold , daniel a. keim , hans-peter kriegel. venue: the vldb journal -- the international journal on very large data bases. year: 1997