@misc{indiciae7d38f8b85b7d,
  title = {Variation of Nb-Ta, Zr-Hf, Th-U and K-Cs in two diabase-granophyre suites},
  author = {D. Gottfried and L. P. Greenland and E.Y. Campbell},
  year = {1968},
  doi = {10.1016/0016-7037(68)90059-8},
  url = {https://pubs.usgs.gov/publication/70011475},
  note = {Source identifier: 70011475}
}