1. Vertical distribution and temperature profile of the nighttime atmospheric sodium layer by laser backscatter;Blamont;Ann. Geophys.,1972
2. Vertical movement of temperate-zone sporadic E layers;Chimonas;J. Geophys. Res.,1968
3. Simultaneous observations of the Na 5893Å nightglow and the distribution of sodium atoms in the mesosphere;Clemesha;J. Geophys. Res.,1978
4. On the ionospheric conditions in the D region and lower E region;Donahue;J. Geophys. Res.,1966
5. Donahue , T. M. Positive ion chemistry of the D-region “Meteorological and chemical factors in D-region aeronomy” 286 294 Aeronomy Laboratory, Dept. of Electrical Engineering, University of Illinois 1969