@misc{indiciae3478e35476b9,
  title = {Particle acceleration by electrostatic waves with spatially varying phase velocities.},
  author = {Gary, S. P. and Montgomery, D. and Swift, D. W.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19690036039},
  note = {Source identifier: 19690036039}
}