ISBN 9780521136587 books & textbook
Symmetries and Integrability of Difference Equations (London Mathematical Society Lecture Note Series, Series Number 381)
Levi, Decio Olver, Peter Thomova, Zora Winternitz, Pavel
Cambridge University Press /2011-08-08 Paperback / 360 Pages
isbn-10: 052113658X / isbn-13: 9780521136587
