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\url{http://www.cs.hku.hk/research/techreps/document/TR-2014-09.pdf}  \subsubsection{Some references that need exploring}  George S. Fishman. 1986. A Comparison of Four Monte Carlo Methods for Estimating the Probability of s-t Connectedness. IEEE Trans. Reliability 35, 2 (1986).  Ruoming Jin, Lin Liu, Bolin Ding, and Haixun Wang. 2011. Distance-Constraint Reachability Computation