New approach for Damping in a squeezed bath and its time evolution   through Complete Class of Gaussian Quasi-distributions
  By virtue of the thermal entangled states representation of density operator and using dissipative interaction picture we solve the master equation of a driven damped harmonic oscillator in a squeezed bath. We show that the essential part of the dynamics can be expressed by the convolution of initial Wigner function with a special kind of normalized Gaussian in phase space and relate the dynamics with the change of Gaussian ordering of density operator. 
Mohammad Reza Bazrafkan and Seyed Mahmoud Ashrafi and Fahimeh Naghdi
quant-ph