Trace Ideals for Fourier Integral Operators with Non-Smooth Symbols III
  We consider Fourier integral operators with symbols in modulation spaces and non-smooth phase functions whose second orders of derivatives belong to certain types of modulation space. We establish continuity and Schatten-von Neumann properties of such operators when acting on modulation spaces. 
Joachim Toft, Francesco Concetti, Gianluca Garello