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Birkhoff normal forms for Fourier integral operators II
- American Journal of Mathematics
- Johns Hopkins University Press
- Volume 124, Number 4, August 2002
- pp. 817-850
- 10.1353/ajm.2002.0022
- Article
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In this work we construct logarithms and Birkhoff normal forms for elliptic Fourier integral operators in the semi-classical limit, under more general assumptions than in a previous work by the first author. The methods are similar but slightly different.