Vladimir BatageljFranz J. BrandenburgWalter DidimoGiuseppe LiottaMaurizio Patrignani08191 Working Group Report - X-graphs of Y-graphs and their Representations.2008Graph Drawing with Applications to Bioinformatics and Social Scienceshttp://drops.dagstuhl.de/opus/volltexte/2008/1556/conf/dagstuhl/2008P8191db/conf/dagstuhl/P8191.html#BatageljBDLP08