I have been looking for a composite dispersion relation in complex plasmas with both the "DIAW" and "DAW" features depending on the separable observation time scales for the last few weeks. The plasma system constitutionally contains both "nanoscopic" and "microscopic" dust grain-like impurity ions amid a global "quasi-neutrality state" in a field-free configuration. Can anyone please extend any help with suitable and useful references in this regard?