Improved Approximation Algorithms for Weighted 2- and 3-Vertex Connectivity Augmentation Problems.

Michal Penn Haya Shasha-Krupnik Improved Approximation Algorithms for Weighted 2- and 3-Vertex Connectivity Augmentation Problems. 187-196 1997 22 J. Algorithms 1 db/journals/jal/jal22.html#PennS97