Encyclopedia of Mathematics and its applications <br/><br/>
Exact constants in approximation theory  / 

 - Cambridge:  Cambridge University Press,  1991 
 - xii, 452p. Index. 
 - Encyclopedia of Mathematics and its applications  38 .
<br/><br/> "Translated from the Russian by K. Ivanov" 
<br/><br/><label>Dewey Class. No.: </label>510.3  / En56.38