@misc{indiciaef0c40b8d4c1c,
  title = {Maxwell Duality, Lorentz Invariance, and Topological Phase},
  author = {Dowling, J. and Williams, C. and Franson, J.},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/20060040776},
  note = {Source identifier: 20060040776}
}