@misc{indiciae6506fa323126,
  title = {Causality with noncausal optical potentials.},
  author = {VA Madsen and KI Goldman},
  year = {1995},
  doi = {10.1103/physrevc.51.2011},
  url = {https://pubmed.ncbi.nlm.nih.gov/9970270/},
  note = {Source identifier: 9970270}
}