1. Die Mathematischen Hilfsmittel des Physikers, Springer, Berlin, 1936, p. 359;
2. A chart of consecutive sets of electronic orbits within atoms of chemical elements
3. in The periodic table: into the 21 st century (Eds.: ), Research Studies Press, Baldock, 2004, Ch. 12.
4. The Nature of the Chemical Bond, Cornell, Ithaka NY, 1938 ff; L. Pauling, General Chemistry, Freeman, San Fransisco CA, 1947 ff.
5. Elementary quantum chemistry, McGraw-Hill, New York, 1968 ff.