Geodesic
Exact values of best one-sided approximations of certain classes of periodic functions
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1979), pp. 20-25.

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@article{IVM_1979_8_a2,
     author = {V. G. Doronin and A. A. Ligun},
     title = {Exact values of best one-sided approximations of certain classes of periodic functions},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {20--25},
     publisher = {mathdoc},
     number = {8},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1979_8_a2/}
}
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V. G. Doronin; A. A. Ligun. Exact values of best one-sided approximations of certain classes of periodic functions. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1979), pp. 20-25. http://geodesic.mathdoc.fr/item/IVM_1979_8_a2/