Paola Flocchini Alessandro Roncato Nicola Santoro Computing on anonymous networks with sense of direction. 355-379 2003 1-3 Theor. Comput. Sci. 301 http://dx.doi.org/10.1016/S0304-3975(02)00592-3 db/journals/tcs/tcs301.html#FlocchiniRS03