1) Polylogarithmic
Inapproximability of Radio Broadcast
2) Comparing min-power and min-cost node connectivity problems.
4) Tight approximation for connectivity augmentation problems
5) Approximation algorithm for non-uniform multicommodity
buy at bulk
6) Shallow-light k-trees and k-trees for buy at bulk
7) Multicoloring: problems and techniques
8) Complete partitions of graphs
9) Finding graphs with maximum number of edges with girth at least g