@article{SIGMA_2017_13_a67,
     author = {Boris A. Percino-Figueroa},
     title = {Null {Angular} {Momentum} and {Weak} {KAM} {Solutions} of the {Newtonian} $N${-Body} {Problem}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2017},
     volume = {13},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2017_13_a67/}
}