Iris van Rooij Matthew Hamilton Moritz Müller Todd Wareham Approximating Solution Structure. 2007 Structure Theory and FPT Algorithmics for Graphs, Digraphs and Hypergraphs http://drops.dagstuhl.de/opus/volltexte/2007/1234 conf/dagstuhl/2007P7281 db/conf/dagstuhl/P7281.html#RooijHMW07