@techreport{AbdelHamidAscheuerGroetschel1998, author = {Atef Abdel-Aziz Abdel-Hamid and Norbert Ascheuer and Martin Gr{\"o}tschel}, title = {Order Picking in an Automatic Warehouse: Solving Online Asymmetric TSPs}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {SC-98-08}, language = {eng}, year = {1998} }