Broer09
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Henk W. Broer. Normal forms in perturbation theory. In Robert A. Meyers (eds.) Encyclopedia of Complexity and Systems Science. ' Springer (2009). MathSciNet, arXiv.
Henk W. Broer. Normal forms in perturbation theory. In Robert A. Meyers (eds.) Encyclopedia of Complexity and Systems Science. ' Springer (2009). MathSciNet, arXiv.