@article{delshams2016exponentially,
	title={Exponentially small splitting of separatrices and transversality associated to whiskered tori with quadratic frequency ratio},
	author={Delshams, Amadeu and Gonchenko, Marina and Guti{\'e}rrez, Pere},
	journal={SIAM Journal on Applied Dynamical Systems},
	volume={15},
	number={2},
	pages={981--1024},
	year={2016},
	publisher={SIAM}
}