Frederic Dorn Fedor V. Fomin Dimitrios M. Thilikos Subexponential Parameterized Algorithms. 15-27 2007 conf/icalp/2007 ICALP http://dx.doi.org/10.1007/978-3-540-73420-8_4 db/conf/icalp/icalp2007.html#DornFT07