@misc{indiciaee1150ba85e9b,
  title = {String-ghost interactions and the trace anomaly.},
  author = {DZ Freedman and P Ginsparg and CM Sommerfield and NP Warner},
  year = {1987},
  doi = {10.1103/physrevd.36.1800},
  url = {https://pubmed.ncbi.nlm.nih.gov/9958364/},
  note = {Source identifier: 9958364}
}