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Bibliography

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P. Hartman and A. Wintner, On an oscillation criterion of Liapounoff, Amer. J. Math. vol. 73 (1951) pp. 885-890. MR 0045897 (13:652e)

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E. Hille, Remarks on a paper by Zeev Nehari, Bull. Amer. Math. Soc. vol. 55 (1949) pp. 552-553. MR 0030000 (10:697a)

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Z. Nehari, The Schwarzian derivative and schlicht functions, Bull. Amer. Math. Soc. vol. 55 (1949) pp. 545-551. MR 0029999 (10:696e)

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V. V. Pokornyi, On some sufficient conditions for univalence, Doklady Akademii Nauk SSSR (N.S.) vol. 79 (1951) pp. 743-746. MR 0043207 (13:222f)