@misc{indiciae7d34998eb3b9,
  title = {Mass fractionation in hydrodynamic escape},
  author = {Hunten, Donald M. and Pepin, Robert O. and Walker, James C. G.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19870049991},
  note = {Source identifier: 19870049991}
}