%0 Journal Article %A Tomasz Stachowiak %A Andrzej J. Maciejewski %T Non-Integrability of the Kepler and the Two-Body Problems on the Heisenberg Group %J Symmetry, integrability and geometry: methods and applications %D 2021 %V 17 %U http://geodesic.mathdoc.fr/item/SIGMA_2021_17_a73/ %G en %F SIGMA_2021_17_a73