Powell, M.J.D. <br/><br/>
Approximation theory and methods / 
M.J.D. Powell. 
 - Cambridge :  Cambridge University Press,  1981. 
 - x, 339 p.  ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0521295149 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Approximation theory.