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Bibliography

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L. Fountain and L. Jackson, A generalized solution of the boundary value problem for , Pacific J. Math. 12 (1962), 1251-1272. MR 0163002 (29:305)

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

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L. Jackson and K. Schrader, On second order differential inequalities, Proc. Amer. Math. Soc. 17 (1966), 1023-1027. MR 0200510 (34:401)

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M. Peixoto, Generalized convex functions and second order differential inequalities, Bull. Amer. Math. Soc. 55 (1949), 563-572. MR 0029949 (10:686a)