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Fisher, S.D., Jerome, J.W. (1975). A pólya algorithm for the favard solution, N-width characterizations and Whitney type theorems. In: Minimum Norm Extremals in Function Spaces. Lecture Notes in Mathematics, vol 479. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0097075
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DOI: https://doi.org/10.1007/BFb0097075
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