2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/62628In 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 work by the first author. The methods are similar but slightly different.30 pagesSpectral TheoryMathematical Physics34C20; 34K17; 35S05; 35S30; 37J40; 70K45; 81Q20text