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Prokhorov, D.V., Stepanov, V.D. & Ushakova, E.P. Hardy–Steklov Integral Operators: Part I. Proc. Steklov Inst. Math. 300 (Suppl 2), 1–112 (2018). https://doi.org/10.1134/S008154381803001X
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DOI: https://doi.org/10.1134/S008154381803001X