On linear processes of approximation (I)

Instytut Matematyczny Polskiej Akademii Nauk / Institute of Mathematics / Publishing house / Journals and Serials / Studia Mathematica / All issues

G. Freud, S. Knapowski Studia Mathematica 23 (1963), 105-112 DOI: 10.4064/sm-23-2-105-112