Geodesic
Extremal projectors and generalized Mickelsson algebras over reductive Lie algebras
Izvestiya. Mathematics , Tome 33 (1989) no. 1, pp. 85-100.

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A description is given of “extremal projectors” in the associative envelopes of reductive (finite-dimensional) Lie algebras. In terms of extremal projectors, a description is then obtained of (generalized) Mickelsson algebras. Finally, a characterization is given for these algebras in terms of generators and relations. Bibliography: 14 titles. 
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D. P. Zhelobenko. Extremal projectors and generalized Mickelsson algebras over reductive Lie algebras. Izvestiya. Mathematics , Tome 33 (1989) no. 1, pp. 85-100. http://geodesic.mathdoc.fr/item/IM2_1989_33_1_a3/

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