@misc{indiciae3c119f82184a,
  title = {Effective potential for quantum correlation functions.},
  author = {A Cuccoli and V Tognetti and R Vaia},
  year = {1991},
  doi = {10.1103/physreva.44.2734},
  url = {https://pubmed.ncbi.nlm.nih.gov/9906257/},
  note = {Source identifier: 9906257}
}