Барьер неизвестности (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Барьер неизвестности" in Russian language version.

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Russia May Already Be Flight Testing a Dyna-Soar. (англ.) // Missiles and Rockets : Magazine of World Astronautics. — Washington, D.C.: American Aviation Publications, Inc., January 11, 1960. — Vol. 6 — No. 2 — P. 13.
Reds May Have Dyna-Soar Type Vehicle. (англ.) // Missiles and Rockets : The Missile/Space Weekly. — Washington, D.C.: American Aviation Publications, Inc., September 5, 1960. — Vol. 7 — No. 10 — P. 14.