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Berry, MV (1977) Semi-Classical Mechanics in Phase Space: A Study of Wigner's Function. In: Philosophical Transactions of the Royal Society of London series A-Mathematical Physical and Engineering Sciences, 287 (1343). pp. 237-271.
Berry, MV and Tabor, M (1977) Calculating the bound spectrum by path summation in action-angle variables. In: Journal of Physics A: Mathematical and General, 10 (3). pp. 371-379.