%% -*-BibTeX-*- @TechReport{BorndoerferEisenblaetterGroetschelMartin1998b, author = "Ralf Bornd{\"o}rfer and Andreas Eisenbl{\"a}tter and Martin Gr{\"o}tschel and Alexander Martin", title = "The Orientation Model for Frequency Assignment Problems", type = "ZIB Technical Report", number = "TR-98-01", institution = "ZIB", address = "Takustr. 7, 14195 Berlin", year = "1998", URL = "http://opus.kobv.de/zib/volltexte/1998/563/", language = "English", }