TY  - DATA
AU  - Levasseur, T.
AU  - Stafford, J. T.,
TI  - Rings of differential operators on classical rings of invariants 
T2  - Memoirs of the American Mathematical Society, 
SN  - 9781470408350 (online)
PY  - 1989///
CY  - Providence, R.I., USA
PB  - American Mathematical Society
UR  - http://www.ams.org/memo/0412
ER  -