@techreport{BodlaenderGrigorievKoster2005, author = {Hans L. Bodlaender and Alexander Grigoriev and Arie M.C.A. Koster}, title = {Treewidth Lower Bounds with Brambles}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {05-54}, language = {eng}, year = {2005} }