@article{10_4153_CJM_1978_002_6,
     author = {Hahn, Kyong T.},
     title = {Geometry on the {Unit} {Ball} of a {Complex} {Hilbert} {Space}},
     journal = {Canadian journal of mathematics},
     pages = {22--31},
     year = {1978},
     volume = {30},
     number = {1},
     doi = {10.4153/CJM-1978-002-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1978-002-6/}
}