@misc{indiciae86acfb97b357,
  title = {Fortran '77 programs for computing data fitting functions based on a principle of minimum integrated squared curvature},
  author = {R.D. Watts},
  year = {1982},
  doi = {10.3133/ofr82831},
  url = {https://pubs.usgs.gov/publication/ofr82831},
  note = {Source identifier: ofr82831}
}