Citations of

William Y.C. Chen, H. Galbraith and J. D. Louck, Angular momentum theory, umbral calculus, and combinatorics, Comput. Math. Appl., 41 (2001) 1199-1214.

  1. D. Levi and P. Winternitz, Continuous symmetries of difference equations, J. Phys. A, 39 (2006) R1-R63.

  2. J.D. Louck, Unitary group theory and the discovery of the factorial Schur functions. Conference on Combinatorics and Physics (Los Alamos, NM, 1998). Ann. Comb. 4(2000) 413--432.

  3. O.V. Viskov, Schwinger's formula for the scalar product, Russian Math. Surveys, 60(2005) 380-381.

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