@article{delshams2018shadowing,
	title={Shadowing of non-transversal heteroclinic chains},
	author={Delshams, Amadeu and Simon, Adri{\`a} and Zgliczy{\'n}ski, Piotr},
	journal={Journal of Differential Equations},
	volume={264},
	number={5},
	pages={3619--3663},
	year={2018},
	publisher={Elsevier}
}