Geodesic
The Chebyshev point of a system of translations of subspaces of a Banach space
Matematičeskie zametki, Tome 8 (1970) no. 1, pp. 29-40.

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A geometrical characteristic of the closure of a sum of subspaces of a Banach space is derived and is subsequently used in the description of systems of translations of spaces having a Chebyshev point. 
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     author = {P. K. Belobrov},
     title = {The {Chebyshev} point of a system of translations of subspaces of a {Banach} space},
     journal = {Matemati\v{c}eskie zametki},
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     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_8_1_a3/}
}
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P. K. Belobrov. The Chebyshev point of a system of translations of subspaces of a Banach space. Matematičeskie zametki, Tome 8 (1970) no. 1, pp. 29-40. http://geodesic.mathdoc.fr/item/MZM_1970_8_1_a3/