Levi, D., et al (ed) <br/><br/>
Symmetries & integrability of difference equations 
Ed by D.Levi, et al 
 - Providence  American Mathematical Society  1996 
 - xii  388 
 - CRM proceedings & lecture notes 9 .
<br/><br/><label>ISBN: </label>9780821806012 
<br/><br/><label>Dewey Class. No.: </label>10.13  / LEVI