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    17 September 1992
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    Van Dyke matching
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    multiple scale methods
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    textbook
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    perturbation theory for algebraic and differential equations
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    oscillatory phenomena
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    Lindstedt's method
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    asymptotic expansion
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    periodic solutions
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    self- sustained and forced oscillations
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    method of averaging
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    singularly perturbed linear second order equations
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    French duck phenomenon
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    methods of WKB type
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