:Abstrakte Reaume und Approximation. Proceedings of the conference held at the Mathematical Research Institute at Oberwolfach, Black Forest, July 18-27, 1968
/ Edited by P. L. Butzer and B. Szeokefalvi-Nagy
Basel,Stuttgart
: Birkheauser
, 1969.
423 p. port. 25 cm.
(International series of numerical mathematics, v. 10.)