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Contributions to the problem of approximation of equidistant data by analytic functions. Part A: On the problem of smoothing or graduation. A first class of analytic approximation formulae. Part B: On the problem of osculatory interpolation. A second class of analytic approximation formulae. (English) Zbl 0061.28804
Q. Appl. Math. 4, 45-99, 112-141 (1946).