@misc{indiciae999f047b6b86,
  title = {Approximate angular distribution and spectra for geomagnetically trapped protons in low-earth orbit},
  author = {Watts, J. W. and Parnell, T. A. and Heckman, H. H.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19900038253},
  note = {Source identifier: 19900038253}
}