Fourier integral operators with complex-valued phase functions. (English) Zbl 0306.42007

Fourier Integr. Oper. part. differ. Equat., Colloq. int. Nice 1974, Lect. Notes Math. 459, 120-223 (1975).


42A38 Fourier and Fourier-Stieltjes transforms and other transforms of Fourier type
42A75 Classical almost periodic functions, mean periodic functions
58J99 Partial differential equations on manifolds; differential operators