Sur les corps liés aux algèbres enveloppantes des algèbres de Lie Izrail M. Gelfand; Alexander A. Kirillov — 1966 Publications Mathématiques de l'IHÉS
Representation-theoretic proof of the inner product and symmetry identities for Macdonald's polynomials Pavel I. Etingof; Alexander A. Kirillov, Jr. — 1996 Compositio Mathematica