KOROVKIN, P.P. <br/><br/>
Linear operators and approximation theory / 
[by] P.P.Korovkin 
 - Delhi  Hindustan pub.  1960 
 - vii, 222 p. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>44642 
<br/><br/><label>Dewey Class. No.: </label>511.4  / KOR