Encyclopedia of Mathematics and its applications <br/><br/>
Pede approximants  : Pt.1 - Basic theory / 

 - Massachusetts:  Addison-Wesley,  1981 
 - 325p. 
 - Encyclopedia of Mathematics and its applications   V. 13 .
<br/><br/><label>Dewey Class. No.: </label>510.3  / En56.13