@techreport{GroetschelLoebelVoelker1996, author = {Martin Gr{\"o}tschel and Andreas L{\"o}bel and Manfred V{\"o}lker}, title = {Optimierung des Fahrzeugumlaufs im {\"O}ffentlichen Nahverkehr}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {SC-96-08}, language = {deu}, year = {1996} }