Heegaard splittings and Morse-Smale flows. Gautschi, Ralf, Robbin, Joel W., Salamon, Dietmar A. (2003) International Journal of Mathematics and Mathematical Sciences
Homotopical dynamics II : Hopf invariants, smoothings and the Morse complex Octavian Cornea (2002) Annales scientifiques de l'École Normale Supérieure
Hyperbolicity, stability, and the criterion of homoclinic points. Hayashi, Shuhei (1998) Documenta Mathematica