@techreport{BorndoerferNeumannPfetsch2009, author = {Ralf Bornd{\"o}rfer and Marika Neumann and Marc Pfetsch}, title = {The Steiner Connectivity Problem}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {09-07}, language = {eng}, year = {2009} }