1. Relativistic effects in structural chemistry
2. Introduction to Relativistic Quantum Chemistry
3. The Effect of Retardation on the Interaction of Two Electrons
4. S. R. Langhoff and C. W. Kern, inModern Theoretical Chemistry, edited by H. F. Schaefer III (Plenum, New York, 1997), Vol. 4, p. 381.
5. L. Visscher,Relativistic Electronic Structure Theory: Fundamentals, edited by P. Schwerdtfeger (Elsevier, Amsterdam, 2002), Chap. 6, Pt. I, p. 295.