Michal Katz Nir A. Katz Amos Korman David Peleg Labeling Schemes for Flow and Connectivity. 23-40 2004 34 SIAM J. Comput. 1 http://epubs.siam.org/sam-bin/dbq/article/43391 db/journals/siamcomp/siamcomp34.html#KatzKKP04