%% -*-BibTeX-*- @TechReport{BorndoerferGroetschelLoebel1998b, author = "Ralf Bornd{\"o}rfer and Martin Gr{\"o}tschel and Andreas L{\"o}bel", title = "Optimization of Transportation Systems", type = "SC", number = "98-09", institution = "Zuse Institute Berlin", month = mar, year = "1998", language = "English", }