This paper gives an account of two articles which illustrate the
use of Resurgence theory for estimating the diference between two complex
invariant manifolds associated with the area-preserving H?enon map for the
first one, and with a Hamiltonian system which stems from the rapidly forced
pendulum for the second one.
Olivé, Carme; Sauzin, D.; Martínez-Seara; Alonso, M. Teresa. "Two Examples of Resurgence". Contemporary Mathematics, 2005, núm. 373, p. 355-371