The ionosphere of Europa from Galileo radio occultations Kliore, A. J. ; Hinson, D. P. ; Flasar, F. M. ; Nagy, A. F. ; Cravens, T. E. Abstract Publication: Science Pub Date: July 1997 DOI: 10.1126/science.277.5324.355 Bibcode: 1997Sci...277..355K