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F. Skof, Approssimazione di funzioni
${\delta}$ -quadratic su dominio restretto, Atti. Accad. Sci. Torino Cl. Sci. Fis. Mat. Natur. 118 (1984), 58-70. - S. M. Ulam, A collection of mathematical problems, Interscience Publ., New York, 1960.