%% -*-BibTeX-*- @InProceedings{BorndoerferLiebchen2008, author = "Ralf Bornd\{"o}rfer and Christian Liebchen", editor = "J\{"o}rg Kalcsics and Stefan Nickel", booktitle = "Operations Research Proceedings 2007", title = "{When Periodic Timetables are Suboptimal}", publisher = "Springer", pages = "449--454", year = "2008", language = "English", }