@techreport{BorndoerferKarbstein2014, author = {Ralf Bornd{\"o}rfer and Marika Karbstein}, title = {Metric Inequalities for Routings on Direct Connections}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {14-04}, language = {eng}, year = {2014} }