Higgins, J. R. <br/><br/>
Completeness and basis properties of sets of special functions   

 - Cambridge  Cambridge University Press  1977 
 - x, 134p. Index 
 - Cambridge tracts in Mathematics, 72 .
<br/><br/>  
<br/><br/><label>Dewey Class. No.: </label>515.5  / H636.CB