@techreport{BorndoerferKarbstein2013, author = {Ralf Bornd{\"o}rfer and Marika Karbstein}, title = {A Primal-Dual Approximation Algorithm for the Steiner Connectivity Problem}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {13-54}, language = {eng}, year = {2013} }