@article{10_4153_CJM_2004_026_6,
     author = {Ni, Yilong},
     title = {Geodesics in a {Manifold} with {Heisenberg} {Group} as {Boundary}},
     journal = {Canadian journal of mathematics},
     pages = {566--589},
     year = {2004},
     volume = {56},
     number = {3},
     doi = {10.4153/CJM-2004-026-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2004-026-6/}
}