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On Approximation Theory, Proceedings of the Conference held in the Mathematical Research Institute at Oberwolfach, Black Forest, August 4-10, 1963. Edited by PL Butzer and J. Korevaar. International Series of Num-erical Mathematics, vol. 5, Birkh~ iuser-Verlag, Basel, 1964, 261 p., SFr. 28.-.