@article{BorndoerferGroetschelPfetsch2007, author = {Ralf Bornd{\"o}rfer and Martin Gr{\"o}tschel and Marc Pfetsch}, title = {A Column-Generation Approach to Line Planning in Public Transport}, journal = {Transportation Science (INFORMS)}, volume = {41}, number = {1}, pages = {123 -- 132}, doi = {10.1287/trsc.1060.0161}, year = {2007}, }