1. Hardy, GH, Littlewood, JE: Contribution to the arithmetic theory of series. Proc. Lond. Math. Soc. 11(2), 411-478 (1912)
2. Babenko, VF, Korneichuk, NP, Kofanov, VA, Pichugov, SA: Inequalities for Derivatives and Their Applications. Naukova Dumka, Kiev (2003) (in Russian)
3. Mordell, LJ: The magnitude of the derivative of a function. J. Lond. Math. Soc. 3, 119-121 (1928)
4. Landau, E: Über einen satz des herrn Littlewood. Rend. Circ. Mat. Palermo 35, 43-49 (1913)
5. Kolmogorov, AN: On inequalities between the upper bounds of the successive derivatives of an arbitrary function on an infinite interval. Uč. Zap. Mosk. Gos. Univ., Mat. 30(3), 3-13 (1939) (in Russian)