BibTeX
@BOOK{
         Levasseur1989RoD,
       AUTHOR = "T. Levasseur and J. T. Stafford",
       TITLE = "Rings of Differential Operators on Classical Rings of Invariants",
       PUBLISHER = "American Mathematical Society",
       SERIES = "Memoirs of the American Mathematical Society",
       NUMBER = "412",
       ADDRESS = "New York",
       YEAR = "1989",
       REFERRED = "[Pusch1996JSa]."
}