Andreas W. M. Dress Yinfeng Xu Binhai Zhu Combinatorial Optimization and Applications, First International Conference, COCOA 2007, Xi'an, China, August 14-16, 2007, Proceedings COCOA Lecture Notes in Computer Science 4616 Springer 2007 978-3-540-73555-7 db/conf/cocoa/cocoa2007.html