Partial differential equations and spectral theory : 

 - Basel ; | Boston :  Birkhäuser Verlag,  2001 
 - x, 353 p. ;  24 cm. 
 - Operator theory, advances and applications ;  v. 126 .
<br/><br/><label>ISBN: </label>3764362197 (alk. paper) | 0817662197 (alk. paper)