@misc{indiciaec2decc4a8e34,
  title = {Deep mantle structure and the postperovskite phase transition.},
  author = {D Helmberger and T Lay and S Ni and M Gurnis},
  year = {2005},
  doi = {10.1073/pnas.0502504102},
  url = {https://pubmed.ncbi.nlm.nih.gov/16217029/},
  note = {Source identifier: 16217029}
}