Operations Research Proceedings 1992 (Papers of the 21th Annual Meeting of DGOR, in cooperation with ÖGOR, Aachen, Germany, September 9-11, 1992), 342-349 STARTPAGE=342;ENDPAGE=349;TITLE=Operations Research Proceedings 1992 (Papers of the 21th Annual Meeting of DGOR, in cooperation with ÖGOR, Aachen, Germany, September 9-11, 1992)