@unpublished{HamacherNickelLabbe1999, author = {Horst W. Hamacher and Stefan Nickel and Martine Labbe}, title = {Multicriteria network location problems with sumb objectives}, institution = {Fachbereich Mathematik}, series = {Report in Wirtschaftsmathematik (WIMA Report)}, number = {15}, year = {1999}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:386-kluedo-4569}, }