@misc{indiciae8aacfcf2c523,
  title = {Time evolution in quantum electrodynamics.},
  author = {K Pachucki},
  year = {1991},
  doi = {10.1103/physreva.44.5407},
  url = {https://pubmed.ncbi.nlm.nih.gov/9906600/},
  note = {Source identifier: 9906600}
}