Yngve Villanger Pinar Heggernes Christophe Paul Jan Arne Telle Interval Completion Is Fixed Parameter Tractable. 2007-2020 2009 38 SIAM J. Comput. 5 http://dx.doi.org/10.1137/070710913 db/journals/siamcomp/siamcomp38.html#VillangerHPT09