Geodesic
Characteristic of Chebyshev subspaces of finite codimension in $L_1$
Matematičeskie zametki, Tome 7 (1970) no. 2, pp. 155-163 
A. L. Garkavi. Characteristic of Chebyshev subspaces of finite codimension in $L_1$. Matematičeskie zametki, Tome 7 (1970) no. 2, pp. 155-163. http://geodesic.mathdoc.fr/item/MZM_1970_7_2_a2/
@article{MZM_1970_7_2_a2,
     author = {A. L. Garkavi},
     title = {Characteristic of {Chebyshev} subspaces of finite codimension in $L_1$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {155--163},
     year = {1970},
     volume = {7},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_2_a2/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A criterion is established for Chebyshev subspaces of finite codimension in the space of summable functions.