Geodesic
Bernstein Diameters for the Classes of Periodic Functions of Several Variables
Mathematica balkanica, Tome 5 (1991) no. 3, p. 229 
E. M. Galeev. Bernstein Diameters for the Classes of Periodic Functions of Several Variables. Mathematica balkanica, Tome 5 (1991) no. 3, p. 229. http://geodesic.mathdoc.fr/item/MABA_1991_5_3_a5/
@article{MABA_1991_5_3_a5,
     author = {E. M. Galeev},
     title = {Bernstein {Diameters} for the {Classes} of {Periodic} {Functions} of {Several} {Variables}},
     journal = {Mathematica balkanica},
     pages = {229},
     year = {1991},
     volume = {5},
     number = {3},
     url = {http://geodesic.mathdoc.fr/item/MABA_1991_5_3_a5/}
}
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