@article{05312535, title = {Periodic orbits with least period three on the circle.}, journal = {Fixed Point Theory and Applications [electronic only]}, volume = {2008}, year = {2008}, doi = {10.1155/2008/194875}, zbl = {1144.37434}, language = {en}, url = {http://dml.mathdoc.fr/item/05312535} }
Zhao, Xuezhi. Periodic orbits with least period three on the circle.. Fixed Point Theory and Applications [electronic only], Tome 2008 (2008) . doi : 10.1155/2008/194875. http://gdmltest.u-ga.fr/item/05312535/