Integer Programming and Combinatorial Optimization 6th International IPCO Conference Houston, Texas, June 22-24, 1998 Proceedings - Bixby, Robert E.; Bixby, Robert E.; Boyd, Andrew E.; Boyd, Andrew E.; Rios-Mercado, Roger Z.; Rios-Mercado, Roger Z. (Springer Berlin Heidelberg : Imprint: Springer, 1998)