@misc{indiciae083500b90246,
  title = {Periodic cometary showers: Real or imaginary?},
  author = {Grieve, R. A. F. and Sharpton, V. L. and Goodacre, A. K. and Garvin, J. B.},
  year = {1985},
  url = {https://ntrs.nasa.gov/citations/19850018244},
  note = {Source identifier: 19850018244}
}