00357nam a2200121 a 450000500170000008200200001710000060003711000180004324500890006126000290015030000240017949000320020320251203091555.0  a512.55,bD, ope  d_  aConnes, Alian  aOperator algebras, unitary representations, enveloping algebras and invariant theory  aBostonbBirkhauserc1990  axviii, 582p, 23 cm.  aProgress in mathematicsd92