@article{delshams2016instability,
	title={Instability of high dimensional hamiltonian systems: Multiple resonances do not impede diffusion},
	author={Delshams, Amadeu and De La Llave, Rafael and Seara, Tere M},
	journal={Advances in Mathematics},
	volume={294},
	pages={689--755},
	year={2016},
	publisher={Elsevier}
}