contributions to operator theory in spaces with an indefinite metric   
ed by A.Dijksma etal 
 - Basel  Birkhauser verlag  1998 
 - vi, 417p 
 - Operator theory  advances and applications  vol. 106 .
<br/><br/><label>ISBN: </label>3764360038 
<br/><br/><label>Dewey Class. No.: </label>515.724  / N985