1. J. D. Bernal, The Origin of Life. Weidenfeld and Nicolson, London, 1967.
2. L. B. Young, The Mystery of Matter. Oxford University Press, New York, 1965.
3. F. J. Budden, The Fascination of Groups. University Press, Cambridge, 1972.
4. Ibid.
5. A. V. Shubnikov, V. A. Koptsik, Symmetry in Science and Art, Plenum Press, New York and London, 1974. Russian original: Simmetriya v nauke i iskusstve, Nauka, Moscow, 1972.