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3. Hardy, G.H., Littlewood, J.E., Pólya, G. Inequalities (Cambridge University Press, Cambridge, 1934; MTsMNO, Moscow, 2008).
4. Gini, C. Means (Statistika, Moscow, 1970) [in Russian].
5. Khatskevich, V.L. “On the Law of Large Numbers for Nonlinear Mean Random Variables”, Russian Math. (Iz. VUZ) 8, 70–77 (2019).