@article{GDZPPN002102250,
title = {Cycles and measure of bifurcation sets for two-dimensional diffeomorphisms.},
journal = {Inventiones mathematicae},
volume = {82},
year = {1985},
pages = {397-422},
zbl = {0579.58005},
url = {http://dml.mathdoc.fr/item/GDZPPN002102250}
}
Palis, J., Takens, F. Cycles and measure of bifurcation sets for two-dimensional diffeomorphisms.. Inventiones mathematicae, Tome 82 (1985) pp. 397-422. http://gdmltest.u-ga.fr/item/GDZPPN002102250/