References
L. V. Keldysh, “On Simple Functions of Class α,” Dokl. Akad. Nauk SSSR 4 (4), 192–197 (1934).
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Published in Russian in Trudy Matematicheskogo Instituta imeni V.A. Steklova, 2011, Vol. 274, pp. 10–14.
The original Russian text was first published in Uch. Zap. Mosk. Gos. Ped. Inst. im. V.I. Lenina 138 (3), 3–10 (1958).
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Novikov, P.S., Adian, S.I. On a semicontinuous function. Proc. Steklov Inst. Math. 274, 4–8 (2011). https://doi.org/10.1134/S0081543811060022
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DOI: https://doi.org/10.1134/S0081543811060022