Colin Cooper Alan M. Frieze Tomasz Radzik Multiple Random Walks and Interacting Particle Systems. 399-410 2009 ICALP (2) http://dx.doi.org/10.1007/978-3-642-02930-1_33 conf/icalp/2009-2 db/conf/icalp/icalp2009-2.html#CooperFR09