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math.SP2002
Birkhoff Normal Forms in Semi-Classical Inverse Problems
A. Iantchenko, J. Sjoestrand, M. Zworski
We apply recent results on semi-classical trace formulae and on Birkhoff normal forms for semi-classical Fourier integral operators to a wide range of semi-classical and high energ…
math.SP2001
Birkhoff normal forms for Fourier integral operators II
A. Iantchenko, J. Sjoestrand
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 aprevious…