@misc{indiciae167ca12d8106,
  title = {PPS-87: a new event oriented solar proton prediction model.},
  author = {D F Smart and M A Shea},
  year = {1989},
  doi = {10.1016/0273-1177(89)90450-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/11537304/},
  note = {Source identifier: 11537304}
}