Shivam Garg 0001 Geevarghese Philip Raising The Bar For Vertex Cover: Fixed-parameter Tractability Above A Higher Guarantee. 1152-1166 2016 SODA https://doi.org/10.1137/1.9781611974331.ch80 http://dl.acm.org/citation.cfm?id=2884515 conf/soda/2016 db/conf/soda/soda2016.html#GargP16