@misc{indiciaea2d9a9c5c2b1,
  title = {Solar coronal holes and cosmic ray intensity variations},
  author = {Venkatesan, D. and Agrawal, S. P. and Lanzerotti, L. J. and Hansen, R. T.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800009706},
  note = {Source identifier: 19800009706}
}