@misc{indiciae11b23eb7097b,
  title = {A general purpose ANSI FORTRAN-IV subroutine system for sorting data},
  author = {Gerald Ian Evenden},
  year = {1976},
  doi = {10.3133/ofr76306},
  url = {https://pubs.usgs.gov/publication/ofr76306},
  note = {Source identifier: ofr76306}
}