@misc{indiciaeb07c56bec23b,
  title = {The free-electron laser - Maxwell's equations driven by single-particle currents},
  author = {Colson, W. B. and Ride, S. K.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800054705},
  note = {Source identifier: 19800054705}
}