@techreport{KosterOrlowskiRaacketal.2007, author = {Arie M.C.A. Koster and Sebastian Orlowski and Christian Raack and Georg Bayer and Thomas Engel}, title = {Single-layer Cuts for Multi-layer Network Design Problems}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {07-21}, language = {eng}, year = {2007} }