1. N.F. Mott, H.S.W. Massey, The Theory of Atomic Collisions, Oxford University Press, London, 1965, Chapter XVIII.
2. J.R. Taylor, Scattering Theory, Wiley, New York, 1972, Chapter 11.
3. D. Bohm, Quantum Theory, Prentice-Hall, Englewood Cliffs, NJ, 1951.
4. Measurable consequences of a dip in the activation barrier for an adiabatic chemical reaction