A survey on the set of periods of the graph homeomorphisms

El títol de la versió pre-print de l'article és: On the set of periods of the graph homeomorphismsAgraïments: The first author is partially supported by CAPES/DGU Grant number BEX 12566/12-8 and by a FAPESP Grant 2013/13344-0.Agraïments: The second author is partially supported by FEDER-UNAB-10-4E-378, and a CAPES Grant number 88881.030454/2013-01 from the program CSF-PVEIn this paper we summarize the known results on the possible sets of periods of homeomorphisms defined on some classes of finite connected compact graphs, and we present new results