@article{GDZPPN00118122X, title = {On Invariant Closed Curves for One-Step Methods.}, journal = {Numerische Mathematik}, volume = {55}, year = {1987}, pages = {103-122}, zbl = {0617.65082}, url = {http://dml.mathdoc.fr/item/GDZPPN00118122X} }
Beyn, Wolf-Jürgen. On Invariant Closed Curves for One-Step Methods.. Numerische Mathematik, Tome 55 (1987) pp. 103-122. http://gdmltest.u-ga.fr/item/GDZPPN00118122X/