Özgür Ülker Ender Özcan Emin Erkan Korkmaz Linear Linkage Encoding in Grouping Problems: Applications on Graph Coloring and Timetabling. 347-363 2006 conf/patat/2006 PATAT http://dx.doi.org/10.1007/978-3-540-77345-0_22 db/conf/patat/patat2006.html#UlkerOK06