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• Linear operators and approximation= Lineare operatoren und approximation : proceedings of the conference held at the Oberwolfach mathematical research institute, Black Forest, August 14-22, 1971: abhandlungen zur tagung im mathematischen forschungsinstitut Oberwolfach, Schwarzwald,vom 14. bis 22. August 1971 ; edited by P. L. Butzer, J. -P. Kahane, B. Szo?kefalvi - Nagy
  Published: (1972)
• Linear operators and approximation := lineare operatoren und approximation : proceedings of the Conference held at the Oberwolfach Mathematical Research Institute, Black Forest, August 14-22, 1971 =: abhandlungen zur tagung im mathematischen forschungsinstitut Oberwolfach, Scharzwald, vom. 14. bis 22. August 1971 /
  Published: (1972)