Reihe International Series of Numerical MathematicsBautzer ×Springer Basel × Linear Operators and Approximation / Lineare Operatoren und ApproximationProceedings of the Conference held at the Oberwolfach Mathematical Research Institute, Black Forest, August 14–22, 1971 BautzerSpringer BaseleBook2012 Linear Operators and Approximation / Lineare Operatoren und ApproximationProceedings of the Conference held at the Oberwolfach Mathematical Research Institute, Black Forest, August 14–22, 1971 BautzerSpringer BaselSoftcover2012 Linear Operators and Approximation / Lineare Operatoren und ApproximationProceedings of the Conference held at the Oberwolfach Mathematical Research Institute, Black Forest, August 14–22, 1971 BautzerSpringer BaselHardcover1973