Flavia Bonomo Jayme Luiz Szwarcfiter Characterization of classical graph classes by weighted clique graphs. 84-87 2011 CTW http://ctw2011.dia.uniroma3.it/ctw_proceedings.pdf#page=96 conf/colognetwente/2011 db/conf/colognetwente/colognetwente2011.html#BonomoS11