1. A two-gas model of the lunar terminator exosphere;Benson;Proc. of the 7th Lunar Sci.Conf.,1976
2. The electric potential of the lunar surface;Fenner;Geochimica et Cosmochimica Acta,1973
3. Solar wind and extreme ultraviolet modulation of the lunar ionosphere/exosphere;Freeman;Geophys. Res. Lett.,1976
4. Positive ions at the Apollo 12 site resulting from the Apollo 13 S-IVb impact;Freeman;EOS,1970
5. Freeman , J. W. H. K. Hills M. A. Fenner Some results from the Apollo 12 suprathermal ion detector Proc. of theSecond Lunar Science Conf. 3 2093 2102 The MIT Press 1971