1. Probe measurements of electric fields in space;Aggson,1969
2. The distribution of velocities in a slightly non-uniform gas;Burnett,1935
3. The distribution of molecular velocities and the mean motion in a non-uniform gas;Burnett,1935
4. Atmospheric excitation and ionization by ions in strong auroral and man-made electric fields;Cole;J. atmos. terr. Phys.,1971
5. The mobilities of ions in unlike gases;Dalgarno;Phil. Trans. R. Soc.,1958