Tiziana Calamoneri Saverio Caminiti Rossella Petreschi Stephan Olariu On the <i>L</i>(<i>h</i>, <i>k</i>)-labeling of co-comparability graphs and circular-arc graphs. 27-34 2009 53 Networks 1 http://dx.doi.org/10.1002/net.20257 db/journals/networks/networks53.html#CalamoneriCPO09