Vertex cover: further observations and further improvements
Jianer Chen,
Iyad A. Kanj,
and Weijia Jia
J. Algorithms 41(2):280–301, Nov 2001
Proc. 25th Int. Worksh. Graph-Theoretic Concepts in Computer Science (WG 1999), Lecture Notes in Computer Science 1665, Peter Widmayer,
Gabriele Neyer,
and Stephan Eidenbenz, ed., Springer-Verlag, 1999, pp. 313–324
http://www.cs.tamu.edu/faculty/chen/wg.ps
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