Oettl, H. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Zink, M. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Zeller, K. H. (DLR Inst. fuer Hochfrequenztechnik, Oberpfaffenhofen, Germany)
Freeman, A. (JPL Pasadena, CA, United States)