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1982-1983 A criterion of integrability for perturbed nonresonant harmonic oscillators. ``Wick ordering'' of the perturbations in classical mechanics and invariance of the frequency spectrum
Giovanni Gallavotti
Comm. Math. Phys. 87(3): 365-383 (1982-1983).
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Vol.87 • No. 3 • 1982-1983
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