1. Oparin and Haldane met for the first time in 1963, at the Second International Conference on the Origin of Life that was held in Wakulla Springs, FL, USA. For details on this see Fox, W.S., ed. (1965) The Origins of Pebiological Systems: Proceedings of a Conference Conducted at Wakulla Springs, Florida on 27–30 October 1963, Academic Press (New York, NY, USA), p. xv and p. 98
2. For an overview of these historical developments see Fry, I. (2000) The Emergence of Life on Earth: A Historical and Scientific Overview, Rutgers University Press (New Brunswick, NJ, USA)
3. Oparin, A.I. (1967) The Origin of Life (Synge, A., trans.). In Bernal, J.D. The Origin of Life, pp. 199–234 (Appendix I), Weidenfeld and Nicolson (London, UK), p. 203. This was the first time Oparin's 1924 pamphlet was published in English
4. Kamminga, H. (1982), Life from space – a history of panspermia. Vistas in Astronomy 26, pp. 67–86
5. Oparin, A.I. (1967), p. 206 (footnote)