Ioannis Koutis Ryan Williams Limits and Applications of Group Algebras for Parameterized Problems. 653-664 2009 ICALP (1) http://dx.doi.org/10.1007/978-3-642-02927-1_54 conf/icalp/2009-1 db/conf/icalp/icalp2009-1.html#KoutisW09