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The authors wish to thank Instituto de Matematica Pura e Aplicada, Rio de Janeiro, for its support and hospitality.
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Berenstein, C.A., Dostal, M.A. The Ritt theorem in several variables. Ark. Mat. 12, 267–280 (1974). https://doi.org/10.1007/BF02384763
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DOI: https://doi.org/10.1007/BF02384763