@misc{indiciae2e346bc09021,
  title = {Electromagnetic Fields Derived from Non-Commuting Potentials.},
  author = {B Cassen},
  year = {1931},
  doi = {10.1073/pnas.17.7.430},
  url = {https://pubmed.ncbi.nlm.nih.gov/16577379/},
  note = {Source identifier: 16577379}
}