TY - JOUR AU - Kazuyuki Yagasaki AU - Shogo Yamanaka TI - Heteroclinic Orbits and Nonintegrability in Two-Degree-of-Freedom Hamiltonian Systems with Saddle-Centers JO - Symmetry, integrability and geometry: methods and applications PY - 2019 VL - 15 UR - http://geodesic.mathdoc.fr/item/SIGMA_2019_15_a48/ LA - en ID - SIGMA_2019_15_a48 ER -