@techreport{PecherWagler2003, author = {Arnaud Pecher and Annegret Wagler}, title = {On Non-Rank Facets of Stable Set Polytopes of Webs with Clique Number Four}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {03-01}, language = {eng}, year = {2003} }