1. Ernst Haeckel's concept of an evolutionary origin of life
2. in The Origin of Life, Ed. (Izd. Moskovski Rabochii, Moscow, 1924).
3. reprinted in Science and Human Life (Harper Brothers, New York, 1933).
4. and Chemische Evolution und der Ursprung lebender Systeme (Wissenschaftliche Verlagsgesellschaft, Stuttgart, West Germany, 1975).