• 1. A. M. Fink and D. F. St. Mary, On an inequality of Nehari, Proc. Amer. Math. Soc. 21 (1969), 640–642. MR 0240388, https://doi.org/10.1090/S0002-9939-1969-0240388-0
• [1] Philip Hartman, Ordinary differential equations, John Wiley & Sons, Inc., New York-London-Sydney, 1964. MR 0171038
• [2] Masuo Hukuhara, On the zeros of solutions of linear ordinary differential equations, Sûgaku 15 (1963), 108–109 (Japanese). MR 0166428
• [3] A. Ju. Levin, Some estimates for a differentiable function, Dokl. Akad. Nauk SSSR 138 (1961), 37–38 (Russian). MR 0126013
• [4] A. Ju. Levin, A bound for a function with monotonely distributed zeros of successive derivatives, Mat. Sb. (N.S.) 64 (106) (1964), 396–409 (Russian). MR 0167669
• [5] A. Ju. Levin, On linear second-order differential equations, Dokl. Akad. Nauk SSSR 153 (1963), 1257–1260 (Russian). MR 0159060
• [6] Zeev Nehari, On an inequality of Lyapunov, Studies in mathematical analysis and related topics, Stanford Univ. Press, Stanford, Calif., 1962, pp. 256–261. MR 0145149
• [7] G. S. Zaĭceva, A multipoint boundary value problem, Dokl. Akad. Nauk SSSR 176 (1967), 763–765 (Russian). MR 0219795

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A. M. Fink and D. F. St. Mary, On an inequality of Nehari, Proc. Amer. Math. Soc. 21 (1969), 640-642. MR 0240388 (39:1737)

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P. Hartman, Ordinary differential equations, Wiley, New York, 1964. MR 30 #1270. MR 0171038 (30:1270)

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M. Hukuhara, On the zeros of solutions of linear ordinary differential equations, Sûgaku 15 (1963), 108-109. (Japanese) MR 29#3704. MR 0166428 (29:3704)

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A. J. Levin, Some estimates for a differentiable function, Dokl. Akad. Nauk SSSR 138 (1961), 37-38 = Soviet Math. Dokl. 2 (1961), 523-524. MR 23#A3310. MR 0126013 (23:A3310)

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-, A bound for a function with monotonely distributed zeros of successive derivatives, Mat. Sb. 64 (106) (1964), 396-409. (Russian) MR 29#4941. MR 0167669 (29:4941)

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-, On linear second-order differential equations, Dokl. Akad. Nauk SSSR 153 (1963), 1257-1260 = Soviet Math. Dokl. 4 (1963), 1814-1817. MR 28#2278. MR 0159060 (28:2278)

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Z. Nehari, On an inequality of Lyapunov, Studies in Mathematical Analysis and Related Topics, Stanford Univ. Press, Stanford, Calif., 1962, pp. 256-251. MR 26#2684. MR 0145149 (26:2684)

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G. S. Zaĭceva, A multipoint boundary value problem, Dokl. Akad. Nauk. SSSR 176 (1967), 763-765 = Soviet Math. Dokl. 8 (1967), 1183-1185. MR 36#2874. MR 0219795 (36:2874)