Sign of the Cross
Chris Kuzneski
Техника - молодежи №04 1966
Tekhnika Molodezhi Magazine
Наука и жизнь #08-09 1937
Nauka i Zhizn Magazine
Крокодил, 1963 , № 09
Krokodil Magazine
The Alpha Centauri Project (Thinking worlds)
Marco Santini