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1982-1983A criterion of integrability for perturbed nonresonant harmonic oscillators. ``Wick ordering'' of the perturbations in classical mechanics and invariance of the frequency spectrum
Giovanni Gallavotti "A criterion of integrability for perturbed nonresonant harmonic oscillators. ``Wick ordering'' of the perturbations in classical mechanics and invariance of the frequency spectrum," Communications in Mathematical Physics, Comm. Math. Phys. 87(3), 365-383, (1982-1983)
