On Wigner-Ville Spectra and the Unicity of Time-Varying Quantile-Based   Spectral Densities
  The unicity of the time-varying quantile-based spectrum proposed in Birr et al. (2016) is established via an asymptotic representation result involving Wigner-Ville spectra. 
Stefan Birr, Holger Dette, Marc Hallin, Tobias Kley, Stanislav   Volgushev
math.ST stat.TH