@misc{indiciaeccf9692d387a,
  title = {Composition of the earth's upper mantle-I. Siderophile trace elements in ultramafic nodules},
  author = {J. W. Morgan and G.A. Wandless and R.K. Petrie and A.J. Irving},
  year = {1981},
  doi = {10.1016/0040-1951(81)90209-2},
  url = {https://pubs.usgs.gov/publication/70012107},
  note = {Source identifier: 70012107}
}