@techreport{OrlowskiWernerWessaely2012, author = {Sebastian Orlowski and Axel Werner and Roland Wess{\"a}ly}, title = {Estimating trenching costs in FTTx network planning}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {11-49}, language = {eng}, year = {2012} }