@article{10_4064_ap114_1_3,
     author = {Robert Krawczyk},
     title = {Homoclinic orbits for an almost periodically forced
 singular {Newtonian} system in $\mathbb R^3$},
     journal = {Annales Polonici Mathematici},
     pages = {29--43},
     publisher = {mathdoc},
     volume = {114},
     number = {1},
     year = {2015},
     doi = {10.4064/ap114-1-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap114-1-3/}
}