by Smith, D.E, Zuber, M.T, Frey, H.V, Garvin, J.B, Head, J.W, Muhleman, D.O, Pettengill, G.H, Phillips, R.J, Solomon, S.C, Zwally, H.J, Banerdt, W.B, Duxbury, T.C
Published in Science (American Association for the Advancement of Science) (13.03.1998)