Characterization of a class of functions using divided differences.
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Simeonov, Plamen (2000)
Abstract and Applied Analysis
Rasin, Olexandr G., Hydon, Peter E. (2005)
SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Štefan Porubský (2000)
Mathematica Slovaca
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