@article{GDZPPN002035782, title = {The Feigenbaum functional equation and periodic points.}, journal = {Aequationes mathematicae}, volume = {30}, year = {1986}, pages = {202-207}, zbl = {0593.39001}, url = {http://dml.mathdoc.fr/item/GDZPPN002035782} }
Fischer, P. The Feigenbaum functional equation and periodic points.. Aequationes mathematicae, Tome 30 (1986) pp. 202-207. http://gdmltest.u-ga.fr/item/GDZPPN002035782/