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Partly supported by Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq).
This work was performed under the terms of the agreement on association between the Max-Planck-Institut für Plasmaphysik and EURATOM.
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Caldas, I.L., Tasso, H. Constants of motion of nonlinear equations in an extended Poisson formalism. Lett. Nuovo Cimento 24, 500–504 (1979). https://doi.org/10.1007/BF02725454
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DOI: https://doi.org/10.1007/BF02725454