Enceladus's measured physical libration requires a global subsurface ocean

@article{Thomas2016EnceladussMP,
  title={Enceladus's measured physical libration requires a global subsurface ocean},
  author={Peter C. Thomas and Radwan Tajeddine and Matthew S. Tiscareno and Joseph A. Burns and J. Joseph and Thomas J. Loredo and P. Helfenstein and Carolyn C. Porco},
  journal={Icarus},
  year={2016},
  volume={264},
  pages={37-47}
}
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