Mansoor Alicherry Randeep Bhatia Line System Design and a Generalized Coloring Problem. 19-30 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2832&spage=19 2003 conf/esa/2003 ESA db/conf/esa/esa2003.html#AlicherryB03