Reihe International Series of Numerical MathematicsP.L. Butzer ×Springer Basel × Functional Analysis and ApproximationProceedings of the Conference held at the Mathematical Research Institute at Oberwolfach, Black Forest, August 9–16, 198P.L. ButzerSpringer BaseleBook2013 Functional Analysis and ApproximationProceedings of the Conference held at the Mathematical Research Institute at Oberwolfach, Black Forest, August 9–16, 198P.L. ButzerSpringer BaselSoftcover2011 Functional Analysis and ApproximationProceedings of the Conference held at the Mathematical Research Institute at Oberwolfach, Black Forest, August 9–16, 198P.L. ButzerSpringer BaselHardcover1981