In this paper, we present some class of three dimensional
$C^{\infty}$ diffeomorphisms with nondegenerate one-sided homoclinic tangencies $q$ associated with hyperbolic
fixed points $p$ each of which exhibits a horseshoe set. A key point in the proof is the existence of a transverse homoclinic point arbitrarily close to $q$. This result together with Birkhoff-Smale Theorem implies the existence of a horseshoe set arbitrarily close to $q$.
@article{1253539582,
author = {NISHIZAWA, Yusuke},
title = {Existence of horseshoe sets with nondegenerate one-sided homoclinic tangencies in ${\mathbb R}^{3}$},
journal = {Hokkaido Math. J.},
volume = {37},
number = {4},
year = {2008},
pages = { 133-145},
language = {en},
url = {http://dml.mathdoc.fr/item/1253539582}
}
NISHIZAWA, Yusuke. Existence of horseshoe sets with nondegenerate one-sided homoclinic tangencies in ${\mathbb R}^{3}$. Hokkaido Math. J., Tome 37 (2008) no. 4, pp. 133-145. http://gdmltest.u-ga.fr/item/1253539582/