International Symposium on Multivariate Approximation Theory, 2D, Blac

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  Multivariate Approximation Theory: Proceedings of the Conference Held at the Mathematical Research Institute at Oberwolfach, Black Forest, February 4-10, 1979
  by International Symposium on Multivariate Approximation Theory, 2D, Blac, Walter Schempp, Karl Zeller
  Softcover, Springer Verlag, ISBN 3764311029 (3-7643-1102-9)