@article{10_4153_CMB_1980_049_7,
     author = {Lohman, Robert H.},
     title = {Gaps between {Spheres} in {Normed} {Linear} {Spaces}},
     journal = {Canadian mathematical bulletin},
     pages = {347--354},
     year = {1980},
     volume = {23},
     number = {3},
     doi = {10.4153/CMB-1980-049-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1980-049-7/}
}