@techreport{GiovanidisPulaj2011, author = {Anastasios Giovanidis and Jonad Pulaj}, title = {The Multiperiod Network Design Problem: Lagrangian-based Solution Approaches}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {11-31}, language = {eng}, year = {2011} }