@misc{indiciaed41069b4e1ea,
  title = {Wigner distribution function and phase-space formulation of quantum cosmology.},
  author = {E Calzetta and BL Hu},
  year = {1989},
  doi = {10.1103/physrevd.40.380},
  url = {https://pubmed.ncbi.nlm.nih.gov/10011826/},
  note = {Source identifier: 10011826}
}