David P. Williamson
Tight Bounds for Online Weighted Tree Augmentation
Online Constrained Forest and Prize-Collecting Network Design
A Randomized O(log n)-Competitive Algorithm for the Online Connected Facility Location Problem
A 3/2-approximation algorithm for some minimum-cost graph problems
The Online Connected Facility Location Problem
A dual-fitting 3/2-approximation algorithm for some minimum-cost graph problems
An O(log n)-competitive algorithm for online constrained forest problems
A general approach for incremental approximation and hierarchical clustering.
Approximating the smallest $k$-edge connected spanning subgraph by LP-rounding.
Approximation Algorithms for Prize-Collecting Network Design Problems with General Connectivity Requirements.