1. A.F. Cheng, L.A. Young, EOS Trans. AGU, 83, 384, 389 (2002).
2. S. Conard, F. Azad, J. Boldt, A. Cheng, K. Cooper, E. Darlington, M. Grey, J. Hayes, P. Hogue, K. Kosakowski, T. Magee, M. Morgan, E. Rossano, D. Sampath, C. Schlemm, H. Weaver, in Astrobiology and Planetary Missions, ed. by G.R. Gladstone. Proc. SPIE 5906, 2005.
3. K. Horne, star-www.stand.ac.uk/kdh1/pub0/ada/woe/woe.ps, University of St. Andrews, 2004.
4. R.L. McNutt et al., Space Sci. Rev. (2007, this issue)
5. F. Morgan, S.J. Conard, H.A. Weaver, O. Barnouin-Jha, A.F. Cheng, H.W. Taylor, K.A. Cooper, R.H. Barkhouser, R. Boucarut, E.H. Darlington, M.P. Grey, I. Kuznetsov, T.J. Madison, M.A. Quijada, D.J. Sahnow, J.M. Stock, in Astrobiology and Planetary Missions, ed. by G.R. Gladstone. Proc. SPIE 5906, 2005.