@misc{indiciaee8b8ddb94c3f,
  title = {PETRO.CALC.PLOT, Microsoft Excel macros to aid petrologic interpretation},
  author = {G.B. Sidder},
  year = {1994},
  doi = {10.1016/0098-3004(94)90040-x},
  url = {https://pubs.usgs.gov/publication/70017637},
  note = {Source identifier: 70017637}
}