@techreport{WolleKosterBodlaender2004, author = {Thomas Wolle and Arie M.C.A. Koster and Hans L. Bodlaender}, title = {A Note on Contraction Degeneracy}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {04-43}, language = {eng}, year = {2004} }