@misc{indiciae7d6fe7f4f591,
  title = {Mineral equilibria in the system nepheline-alkali feldspar-plagioclase and their petrological significance},
  author = {L.L. Perchuk and I.D. Ryabchikov},
  year = {1968},
  doi = {10.1093/petrology/9.1.123},
  url = {https://pubs.usgs.gov/publication/70221373},
  note = {Source identifier: 70221373}
}