Mahdi Abdelguerfi Edgar Cooper Christ Wynne Kevin Shaw Vincent Miller Robert Broome Barbara Ray A Terrain Database Representation Based on an Extended Vector Product Format. 27-33 CIKM1996/P027.pdf 1996 conf/cikm/96 CIKM db/conf/cikm/cikm96.html#AbdelguerfiCWSMBR96 db/conf/cikm/AbdelguerfiCWSMBR96.html http://doi.acm.org/10.1145/238355.238369