Krishnam Raju Jampani Anna Lubiw The Simultaneous Representation Problem for Chordal, Comparability and Permutation Graphs. 387-398 2009 WADS http://dx.doi.org/10.1007/978-3-642-03367-4_34 conf/wads/2009 db/conf/wads/wads2009.html#JampaniL09