1. Bearden, J. A. ..X-Ray Wavelengths, 1964, published by U.S. Atomic Energy Commission, Division of Technical Information Extension, Oak Ridge.
2. Beeman, W. W. and Friedman, H.Phy. Rev., 1939,56, 392.
3. — and Bearden, J. A...Ibid., 1942,61, 455.
4. Böke, K...Zeit. f. Phy. Chem. N.F., 1957,10, 45 and 59, and 1957,11–326.
5. Cauchois, Y. and Hulubei, H...Longueurs d’ onde des emissions X et des discontinuites d’Absorption X. Hermann and Cie, Paris, 1947.