Hartman's theorem for complex flows in the Poincaré domain John Guckenheimer (1972) Compositio Mathematica
Hausdorff convergence and the limit shape of the unicorns. Krauskopf, Bernd, Kriete, Hartje (1997) Experimental Mathematics
Hyperbolicity, stability, and the criterion of homoclinic points. Hayashi, Shuhei (1998) Documenta Mathematica