Nillsen, R <br/><br/>
Difference spaces & invariant linear forms 
By R. Nillsen 
 - Berlin  Springer  1994 
 - xii  186 
 - Lecture notes in mathematics 1586 .
<br/><br/><label>ISBN: </label>3540583238 
<br/><br/><label>Dewey Class. No.: </label>4.12+5.03  / NILL