@misc{indiciae923e4188ee0e,
  title = {Cometary apparitions - 1990-2010},
  author = {Yeomans, Donald K. and Wimberly, Ravenel N.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19930029601},
  note = {Source identifier: 19930029601}
}