Sourav Chakraborty Eldar Fischer Oded Lachish Arie Matsliah Ilan Newman Testing <i>st</i> -Connectivity. 380-394 2007 conf/approx/2007 APPROX-RANDOM http://dx.doi.org/10.1007/978-3-540-74208-1_28 db/conf/approx/approx2007.html#ChakrabortyFLMN07