@article{SIGMA_2019_15_a48,
     author = {Kazuyuki Yagasaki and Shogo Yamanaka},
     title = {Heteroclinic {Orbits} and {Nonintegrability} in {Two-Degree-of-Freedom} {Hamiltonian} {Systems} with {Saddle-Centers}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2019},
     volume = {15},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2019_15_a48/}
}