@techreport{AscheuerKrumkeRambau1998, author = {Norbert Ascheuer and Sven Krumke and J{\"o}rg Rambau}, title = {The Online Transportation Problem: Competitive Scheduling of Elevators}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {SC-98-34}, language = {eng}, year = {1998} }