@misc{indiciae26cd62b9ed60,
  title = {Magnetospheric cutoff for 1.5-mev extra- terrestrial protons},
  author = {Fan, C. Y. and Simpson, J. A. and Stone, E. C.},
  year = {1964},
  url = {https://ntrs.nasa.gov/citations/19640017295},
  note = {Source identifier: 19640017295}
}