@article{SIGMA_2014_10_a100,
     author = {Richard Montgomery},
     title = {Who's {Afraid} of the {Hill} {Boundary?}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2014},
     volume = {10},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2014_10_a100/}
}