Ion/neutral Escape of Hydrogen and Deuterium: Evolution of Water Donahue, T. M. ; Grinspoon, D. H. ; Hartle, R. E. ; Hodges, R. R., Jr. Abstract Publication: Venus II: Geology, Geophysics, Atmosphere, and Solar Wind Environment Pub Date: 1997 Bibcode: 1997veii.conf..385D