@misc{indiciaeefaa643f0578,
  title = {Variability of Secchi disk readings in an exceptionally clear and deep caldera lake},
  author = {Gary L. Larson and M.W. Buktenica},
  year = {1998},
  url = {https://pubs.usgs.gov/publication/1015821},
  note = {Source identifier: 1015821}
}