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Choodnovsky, G.V., Choodnovsky, D.V. Novel first integrals for the fermi-pasta-ulam lattice with cubic nonlinearity and for other many-body systems in one and three dimensions. Lett. Nuovo Cimento 19, 291–294 (1977). https://doi.org/10.1007/BF02746838
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DOI: https://doi.org/10.1007/BF02746838