1. Banks, P. M., and G. Kockarts, Aeronomy, PartA, Academic Press, 1973.
2. Brekke, A., Physics of the Upper Polar Atmosphere, John Wiley & Sons, 1997.
3. Brekke, A., C. Hall, and T. L. Hansen, EISCAT studies of the auroral ionosphere conductances, Adv. Space Res., 9, 35–38, 1989.
4. Buneman, O., Excitation of field aligned sound waves by electron streams, Phys. Rev. Lett., 10, 285–287, 1963.
5. Burnside, R. G., C. A. Tepley, and V. B. Wickwar, The O+-O collision cross-section-can it be inferred from aeronomical measurements ?, Ann. Geophy., 5, 343–349, 1987.