Akhiezer, N. I. 1901- Theory of approximation/ Translated by Charles J. Hyman. - New York: F. Ungar, [1956]. - 307 p.; 25 cm. LCCN: 56011459 /L/r Nat. Bib. No.: GB58-3561 Subjects--Topical Terms: Numerical analysis. Dewey Class. No.: 517 / A315t