@techreport{OrlowskiKosterRaacketal.2006, author = {Sebastian Orlowski and Arie M.C.A. Koster and Christian Raack and Roland Wess{\"a}ly}, title = {Two-layer Network Design by Branch-and-Cut featuring MIP-based Heuristics}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {06-47}, language = {eng}, year = {2006} }