Joseph Cheriyan András Sebö Zoltán Szigeti An Improved Approximation Algorithm for Minimum Size 2-Edge Connected Spanning Subgraphs. 126-136 http://link.springer.de/link/service/series/0558/bibs/1412/14120126.htm 1998 conf/ipco/1998 IPCO db/conf/ipco/ipco1998.html#CheriyanSS98