@techreport{HelmbergRendlWeismantel1996, author = {Christoph Helmberg and Franz Rendl and Robert Weismantel}, title = {A Semidefinite Programming Approach to the Quadratic Knapsack Problem}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {SC-96-10}, language = {eng}, year = {1996} }