1. P. P. Wegener and H. Ashkenas, ?Wind-tunnel measurements of sphere drag at supersonic speeds and low Reynolds numbers?, J. Fluid Mech., vol. 10, pt. 4, pp. 550?560, 1961.
2. P. A. Taub, ?Hypersonic, low-density sphere and cone drag correlations?, AIAA Journal, vol. 6, no. 8, 1968.
3. G. I. Maslach, D. R. Willis, S. Tang, and D. Ko, ?Recent experimental and theoretical extensions of nearly free-molecular flow?, Rarefied Gas Dynam., New York-London, Acad. Press, vol. 1, pp. 433?443, 1965.
4. G. Koppenwallner, ?Drag and pressure distribution of circular cylinder at hypersonic Mach numbers in the range between continuum flow and free-molecular flow?, Proc. 6-th Internat. Sympos, on Rarefied Gas Dynam., Book of Abstracts, Massachusetts Institute of Technology, vol. 1, sec. A, pp. 283?285, 1968.
5. Y. S. Pan, ?Drag on a cylinder in hypersonic nearly-free molecular flow?, Proc. 6-th Internat. Sympos. on Rarefied Gas Dynam., Book of Abstracts, Massachusetts Institute of Technology, vol. 1, sec. A. pp. 298?302, 1968.