Nastasescu, C. <br/><br/>
Graded and Filtered Rings and Modules 
/ by C. Nastasescu 
 - Berlin:  Springer-Verlag,  1979. 
 - x, 148p.; 
<br/><br/><label>ISBN: </label>3540097082 
<br/><br/><label>Dewey Class. No.: </label>510.8  / NAS/G