@misc{indiciae53ad5b23497f,
  title = {Fokker-Planck equation for pitch angle diffusion in spherical coordinates},
  author = {Fejer, J. A. and Snyder, F. P.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700043962},
  note = {Source identifier: 19700043962}
}