1. The Calculation of Matrix Elements for Lewis Electronic Structures of Molecules
2. Spin-Free Quantum Chemistry.1a III. Bond Functions and the Pauling Rules
3. and ?Quantum Mechanics of Electronic Structure of Simple Molecules? in Encyclopedia of Physics 37, 2 (Springer-Verlag, Berlin, 1961), especially pp. 118-142.
4. ?Spin-Free Quantum Chemistry? in. Advances in Quantum Chemistry, 1, 59-113. (Ed. Academic Press, New York, 1964). Matsen reproduces Kotani's table (see Number [3]) in an appendix and shows how to derive non-diagonal matrix elements from the diagonal elements given by Kotani.
5. Nachr. Akd. Wiss. Göttingen, Math. Physik. Kl. p. 337 (1932).