TY  - BOOK
AU  - Levi, Decio 
AU  - Olver, Peter
AU  - Thomova, Zora
AU  - Winternitz, Pavel
TI  - Symmetries and integrability of difference equations
SN  - 9780521136587 (pbk.)
PY  - 2011///.
CY  - Cambridge: 
PB  - Cambridge University Press, 
N1  - Includes bibliographical references

ER  -