@techreport{EijkhofBodlaenderKoster2002, author = {Frank van den Eijkhof and Hans L. Bodlaender and Arie M.C.A. Koster}, title = {Safe reduction rules for weighted treewidth}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {02-49}, language = {eng}, year = {2002} }