1. Brasseur, G. & Solomon, S. 1986, Aeronomy of the Middle Atmosphere (Dordrecht: Reidel)
2. Chamberlin, J. W. 1961, Physics of the Aurora and Air Glow (New York: Academic)
3. Detection of the N II 122 and 205 micron lines - Densities in G333.6-0.2
4. Dunham, E. W. 1996, Predicted SOFIA Image Sizes based on the SOFIA IV Wind Tunnel Test (SOFIA Engineering Report 5/96) (Moffett Field: NASA/Ames Research Center)
5. Erickson, E. F. 1989, Estimation of Boundary-Layer Limited Seeing on SOFIA (SOFIA Engineering Report 11/89) (Moffett Field: NASA/Ames Research Center)