Johnson E. R. & Low C. H. (1967). "Further spectral observations of grenade glow clouds in the lower thermosphere". Australian Journal of Physics20: 577. doi:10.1071/ph670577. Bibcode: 1967AuJPh..20..577J.
Johnson E. R. & Low C. H. (1967). "Further spectral observations of grenade glow clouds in the lower thermosphere". Australian Journal of Physics20: 577. doi:10.1071/ph670577. Bibcode: 1967AuJPh..20..577J.