Roy Armoni Amnon Ta-Shma Avi Wigderson Shiyu Zhou An <i>O</i>(log(<i>n</i>)<sup>4/3</sup>) space algorithm for (<i>s, t</i>) connectivity in undirected graphs. 294-311 2000 47 J. ACM 2 http://doi.acm.org/10.1145/333979.333984 db/journals/jacm/jacm47.html#ArmoniTWZ00