@article{SIGMA_2021_17_a73,
     author = {Tomasz Stachowiak and Andrzej J. Maciejewski},
     title = {Non-Integrability of the {Kepler} and the {Two-Body} {Problems} on the {Heisenberg} {Group}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2021},
     volume = {17},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2021_17_a73/}
}