Boting Yang Ding-Zhu Du Cao An Wang Combinatorial Optimization and Applications, Second International Conference, COCOA 2008, St. John's, NL, Canada, August 21-24, 2008. Proceedings 5165 2008 978-3-540-85096-0 COCOA Lecture Notes in Computer Science Springer db/conf/cocoa/cocoa2008.html