I would like to learn about the stationary phase method, as part of the theory of Fourier Integral Operators.
From what I can see so far, Hormander's book "The Analysis of Linear Partial Differential Operators I" seems to be the standard reference, but I was wondering whether somebody has some positive experience with alternative textbooks that I could use to supplement Hormander's exposition, in case it gets too dense.
Many thanks for your suggestions !