@misc{indiciae52bcb5866798,
  title = {Rubidium-strontium age of hypersthene},
  author = {Gopalan, K. and Wetherill, G. W.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19690034031},
  note = {Source identifier: 19690034031}
}