Hyperboliity versus partial-hyperbolicity and the transversality-torsion   phenomenon
  In this paper, we describe a process to create hyperbolicity in the neighbourhood of a homoclinic orbit to a partially hyperbolic torus for three degrres of freedom Hamiltonian systems: the transversality-torsion phenomenon. 
Jacky Cresson (LM-Besan\c{c}on), Christophe Guillet (IMB)