Freefall (Tunnels)
Roderick Gordon & Brian Williams
Крокодил, 1959 , № 29
Krokodil Magazine
Техника - молодежи №03 1970
Tekhnika Molodezhi Magazine
Наука и жизнь #07 2004
Nauka i Zhizn Magazine
Everafter Acres
Carolyn Kephart