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(with 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. O.V. Viskov, Schwinger's formula for the scalar product, Russian Math. Surveys 60 (2) 2005 380-381.

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