Gérard Cornuéjols Rainer E. Burkard Gerhard J. Woeginger Integer Programming and Combinatorial Optimization, 7th International IPCO Conference, Graz, Austria, June 9-11, 1999, Proceedings IPCO Lecture Notes in Computer Science 1610 Springer 1999 3-540-66019-4 db/conf/ipco/ipco1999.html