Leszek Gasieniec Ralf Klasing Russell A. Martin Alfredo Navarra Xiaohui Zhang Fast Periodic Graph Exploration with Constant Memory. 26-40 2007 conf/sirocco/2007 SIROCCO http://dx.doi.org/10.1007/978-3-540-72951-8_4 db/conf/sirocco/sirocco2007.html#GasieniecKMNZ07