Invariants under tori of rings of differential operators and related topics /
Musson, Ian M.(Ian Malcolm),1953-
Bergh, M. Van den.
Providence, R.I. : American Mathematical Society,
1998.
"November 1998, volume 136, number 650 (fifth of 6 numbers)."
Includes bibliographical references (p. 83-85).
Differential operators.
Rings (Algebra)
Invariants.