Geodesic
Linear approximations of a certain class of random processes
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 29 (1974) no. 5 
L. B. Sofman. Linear approximations of a certain class of random processes. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 29 (1974) no. 5. http://geodesic.mathdoc.fr/item/RM_1974_29_5_a23/
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     title = {Linear approximations of a~certain class of random processes},
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     year = {1974},
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     number = {5},
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     url = {http://geodesic.mathdoc.fr/item/RM_1974_29_5_a23/}
}
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[1] A. Kolmogoroff, “Über die beste Annäherung an stetige Funktionen”, Ann. of Math., 37 (1936), 107 | DOI | MR

[2] I. I. Gikhman, A. V. Skorokhod, Teoriya sluchainykh protsessov, t. 1, «Nauka», M., 1971 | MR

[3] L. B. Sofman, “Zadacha Shennona”, DAN, 215:6 (1974), 1313–1316 | MR | Zbl