By Bagby T.   Bos L.   Levenberg N.   in Journal of Approximation Theory

ISSN:0021-9045|85|1|69-87

Academic Press‎(1996)‎

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By Bloom T.   Bos L.   Levenberg N.   Waldron S.   in Constructive Approximation

ISSN:0176-4276|32|1|159-179

Springer Publishing Company ‎(2010)‎

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