@misc{indiciae9ad997bc83a9,
  title = {When did the average cosmic ray flux increase?},
  author = {Nishiizumi, K. and Murty, S. V. S. and Marti, K. and Arnold, J. R.},
  year = {1985},
  url = {https://ntrs.nasa.gov/citations/19850026784},
  note = {Source identifier: 19850026784}
}