Svetoslav Markov Dalcidio Moraes Claudio On the Approximation of Centered Zonotopes in the Plane. 246-253 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2907&spage=246 2003 conf/lssc/2003 LSSC db/conf/lssc/lssc2003.html#MarkovC03