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U.E.R. Maths — Paris VII, 2 Place Jussieu, 75221 Paris Cedex 05, France. Published in Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 21, No. 4, pp. 77–78, October–December, 1987.
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Lascoux, A., Schützenberger, M.P. Symmetrization operators on polynomial rings. Funct Anal Its Appl 21, 324–326 (1987). https://doi.org/10.1007/BF01077811
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DOI: https://doi.org/10.1007/BF01077811