Alessandro Bianco Marco Faella Fabio Mogavero Aniello Murano Balanced Paths in Colored Graphs. 149-161 2009 MFCS http://dx.doi.org/10.1007/978-3-642-03816-7_14 conf/mfcs/2009 db/conf/mfcs/mfcs2009.html#BiancoFMM09