Higgins,J.R. <br/><br/>
Completeness and basis properties of sets of special functions / 
Higgins,J.R. 
 - Cambridge:  Cambridge University Press,  1977. 
 - 134p;24cm 
 - Cambridge tracts in mathematics0 521 60488 5 .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0 521 60488 5 
<br/><br/><label>Dewey Class. No.: </label>515.5 HIG