1. R.T. Bayard, D. Alpert, Extension of the low pressure range of the ionization gauge. Rev. Sci. Instrum. 21, 571–572 (1950)
2. K.S.W. Champion, F.A. Marcos, J.P. McIsaac, Atmospheric density measurements by research satellite OV1-15, in Space Res. X (North-Holland, Amsterdam, 1970), pp. 450–458
3. A.B. Christensen, L.J. Paxton, S. Avery, J. Craven, G. Crowley, D.C. Humm, H. Kil, R.R. Meier, C.-I. Meng, D. Morrison, B.S. Ogorzalek, P. Straus, D.J. Strickland, R.M. Swenson, R.L. Walterscheid, B. Wolven, Y. Zhang, Initial observations with the Global Ultraviolet Imager (GUVI) in the NASA TIMED satellite mission. J. Geophys. Res. 108, 1451 (2003). doi: 10.1029/2003JA009918
4. J.H. Clemmons, R.F. Pfaff, The collision meter: An experimental technique to measure changed-neutral interactions and gas composition in the upper atmosphere. Phys. Chem. Earth 26, 247–252 (2001)
5. J.H. Hecht, A.Z. Liu, R.L. Bishop, J.H. Clemmons, C.S. Gardner, M.F. Larsen, R.G. Roble, G.R. Swenson, R.L. Walterscheid, An overview of observations of unstable layers during the Turbulent Oxygen Mixing Experiment (TOMEX). J. Geophys. Res. 109, D02S01 (2004). doi: 10.1029/2002JD003123