@misc{indiciaea1803e78eb78,
  title = {Surface penetrators for planetary exploration: Science rationale and development program},
  author = {Murphy, J. P. and Reynolds, R. T. and Blanchard, M. B. and Clanton, U. S.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19810012471},
  note = {Source identifier: 19810012471}
}