@article{01804075,
title = {Periodic points and chaotic-like dynamics of planar maps associated to nonlinear Hill's equations with indefinite weight.},
journal = {Georgian Mathematical Journal},
volume = {9},
year = {2002},
pages = {339-366},
zbl = {1015.37027},
language = {en},
url = {http://dml.mathdoc.fr/item/01804075}
}
Papini, Duccio; Zanolin, Fabio. Periodic points and chaotic-like dynamics of planar maps associated to nonlinear Hill's equations with indefinite weight.. Georgian Mathematical Journal, Tome 9 (2002) pp. 339-366. http://gdmltest.u-ga.fr/item/01804075/