Martin Gairing Wayne Goddard Stephen T. Hedetniemi Petter Kristiansen Alice A. McRae Distance-two information in self-stabilizing algorithms. 387-398 2004 14 Parallel Processing Letters 3-4 http://dx.doi.org/10.1142/S0129626404001970 db/journals/ppl/ppl14.html#GairingGHKM04