TY  - DATA
AU  - Duval, Guillaume
TI  - Valuations and differential Galois groups 
T2  - Memoirs of the American Mathematical Society, 
SN  - 9781470406158 (online)
PY  - 2010///
CY  - Providence, R.I.
PB  - American Mathematical Society
UR  - http://www.ams.org/memo/0998
ER  -