Article No. 51
Y. A. Prykarpatsky and A. M. Samoilenko: A geometrical generalization of the Poincaré method for an investigation of Lagrangian manifolds of slowly perturbed Hamiltonian systems in a neihborhood of a hyperbolic singular point. Published in vol. 3 (2000), No. 2, pp. 246-255.
Entire volume 3