Achieser, N. I., <br/><br/>
Theory of approximation 
by N. I. Achieser 
 - New York  Frederick Ungar Publishing Co.  1956 
 - 221 p. ; 25 cm. 
<br/><br/> Original Russian edition: Lektsii po teorii aproksimatsii 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Numerical analysis