1. Ambrose, S. (2000) Nothing Like It in the World, Simon & Schuster, New York.
2. BAe (1991) Antonov DB, BAe Military Aircraft, BAe (Space Systems), Chemical Automatics DB, NPO Molnyia, TsAGI & TsIAM, An-225/Interim HoTol Launch System Study, Presentation to the European Space Agency, Paris, June 1991.
3. Bartsev, S.I., and Okhonin, V.A. (1989) The Algorithm of Dual Functioning (Back Propagation): General Approach, Versions and Applications, USSR Academy of Sciences, Siberian Branch, Institute of Biophysics, Preprint IC7B, Krasnoyarsk.
4. Buck, M.L., Zima, W.P., Kirkham, F.S., and Jones, R.A. (1975), “Joint USAF/NASA Hypersonic Research Aircraft Study”, AIAA 75-1039, AIAA 25th Aircraft Systems and Technology Meeting, Los Angeles, California, August 1975.
5. Buran Site Director (1989) Discussion during visit to Baikonur, April 1990.