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Theory of Approximation by N. I. Achieser (1992, Trade Paperback)

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Mikhlin - Approximation on a rectangular grid with application to fi - X555z

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Approximation Algorithms by Vijay V. Vazirani (2002, Hardcover)

New Perspectives on Approximation and Sampling Theory: Festschrift in Honor of P

Approximation Algorithms, Vazirani, Vijay V. V., Excellent Book