Tetsushi Nishida Kokichi Sugihara Voronoi Diagram in the Flow Field. 26-35 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2906&spage=26 2003 conf/isaac/2003 ISAAC db/conf/isaac/isaac2003.html#NishidaS03