1 A. L. Chizhevsky. The Earthly Echo of Solar Storms. Мoscow, 1976. 116.

2 K. E. Tsiolkovsky. The Will of the Universe: Unknown Rational Powers. Kaluga, 1929. 14.

3 A. L. Chizhevsky. The Physical Factors of the Historical Process. Kaluga, 1924. 52.

4 qtd. in: K. Kedrov. Parallel Worlds. 235.

5 V. I. Vernadsky. Studies on Natural Philosophy. Мoscow, 2000. 31.

6 V. I. Vernadsky. Studies on Natural Philosophy. 29–31.