@misc{indiciae6ba5ca72834e,
  title = {Nonequilibrium quantum fields: Closed-time-path effective action, Wigner function, and Boltzmann equation.},
  author = {E Calzetta and BL Hu},
  year = {1988},
  doi = {10.1103/physrevd.37.2878},
  url = {https://pubmed.ncbi.nlm.nih.gov/9958563/},
  note = {Source identifier: 9958563}
}