Full Circle
Pamela Freeman
Крокодил, 1960 , № 16
Krokodil Magazine
Крокодил, 1948 , № 07
Наука и жизнь #06 1949
Nauka i Zhizn Magazine
Warp speed
Travis S. Taylor
Warp Speed (1)
The Quantum Connection
Warp Speed (2)