1. in Advances in Magnetic Resonance, Ed. (Academic Press, New York, 1966). Vol. 2, p. 136
2. in Theoretical Chemistry, Int. Rev. Sci., Ed. (Butterworths, London, 1972). p. 167.
3. in Perturbation Theory and its Applications in Quantum Mechanics, Ed. (Wiley, New York, 1966), p. 145.
4. Perturbation Theory for the Fock-Dirac Density Matrix
5. Self-consistent perturbation thèory