A 2-Approximation for Minimum Cost {0, 1, 2} Vertex Connectivity.

Lisa Fleischer A 2-Approximation for Minimum Cost {0, 1, 2} Vertex Connectivity. 115-129 2001 conf/ipco/2001 IPCO http://link.springer.de/link/service/series/0558/bibs/2081/20810115.htm db/conf/ipco/ipco2001.html#Fleischer01