1. Bird, M. K. & Edenhofer, P. 1991, in Physics and Chemistry in Space, Physics of the Inner Heliosphere, ed. R. Schwenn & E. Marsch (Heidelberg: Springer), 13
2. Bracewell, R. 1965, The Fourier Transform and Its Applications (New York: McGraw-Hill)
3. Chang, E. S. & Deming, D. 1995, in Infrared Tools for Solar Astrophysics: What's Next? ed. J. R. Kuhn & M. J. Penn (Singapore: World Scientific), 47
4. Observations and computations of twilight helium 10,830-Angstrom emission
5. Neutral hydrogen in interplanetary space