@article{small,
  title={A novel iron sulphide mineral switch and its implications for Earth andplanetary science},
  author={David Rickard and Ian B Butler and Anthony Oldroyd},
  journal={Earth and Planetary Science Letters},
  volume={189},
  pages={85-91},
  year={2001},
  doi={10.1016/S0012-821X(01)00352-1}
}