Linear operators and linear systems : 
Partington, Jonathan R. 
 - Cambridge, UK ; | New York :  Cambridge University Press,  2004 
 - ix, 166 p. :  ill. ;  24 cm. 
 - London Mathematical Society student texts ;  60 .
<br/><br/><label>ISBN: </label>0521837340 | 0521546192 (pbk.)