Livsic, M S. et. al. <br/><br/>
Theory of commuting nonselfadjoint operators   
by M S Livsic et. al. 
 - Dordrecht  Kluwer Academic Pub.  1995 
 - xvi, 313p. 
 - Mathematics and its applications  Vol.332 .
<br/><br/><label>ISBN: </label>0792335880 
<br/><br/><label>Dewey Class. No.: </label>515.7246  / N951