@article{10_4153_CMB_1975_119_6,
     author = {Lewis, J. E.},
     title = {A {Banach} {Space} {Whose} {Elements} are {Classes} of {Sets} of {Constant} {Width}},
     journal = {Canadian mathematical bulletin},
     pages = {679--689},
     year = {1975},
     volume = {18},
     number = {5},
     doi = {10.4153/CMB-1975-119-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-119-6/}
}