Altomare, F & Campiti, M <br/><br/>
Korovkin-type approximation theory & its applications 
F. Altomare & M. Campiti 
 - Berlin  Walter de Gruyter  1994 
 - xi  627 
 - De gruyter studies in mathematics 17 .
<br/><br/><label>ISBN: </label>3-11-014178-7 
<br/><br/><label>Dewey Class. No.: </label>5.08  / ALTO