On twice differentiable functions

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Math. Dept, University of Santiago de Chile Casilla, 5659, Correo 2, Santiago de Chile, Chile
Ioana Cioranescu

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Ioana Cioranescu
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Cioranescu, I. On twice differentiable functions. Results. Math. 16, 49–53 (1989). https://doi.org/10.1007/BF03322643

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