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Additional information
Leningrad State University. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 66, No. 1, pp. 146–149, January, 1986.
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Vasil'ev, A.N., Guzev, M.A. Simple proof that an adiabatic invariant is conserved to exponential accuracy over a complete interval of development. Theor Math Phys 66, 97–99 (1986). https://doi.org/10.1007/BF01028943
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DOI: https://doi.org/10.1007/BF01028943