Petushev, P P <br/><br/>
Rational Approximation of Real Functions   
by P P Petushev and V A Popov 
 - Cambridge  Cambridge University Press  1987 
 - vii,371p 
 - Encyclopedia of mathematics and its Applications No.28 .
<br/><br/><label>ISBN: </label>9780521331074 
<br/><br/><label>Dewey Class. No.: </label>515.8  / N87