@misc{indiciaeed2accf0a71b,
  title = {Gauge-invariant correlation functions.},
  author = {J Kapusta and T Toimela},
  year = {1989},
  doi = {10.1103/physrevd.39.3197},
  url = {https://pubmed.ncbi.nlm.nih.gov/9959565/},
  note = {Source identifier: 9959565}
}