1. P. DrudeThe Theory of Optics. English Translation (Longmans, Green & Co.), 1929, p. 302.
2. R. C. MacLaurinThe Theory of Light (Cambridge Univ. Press), Part1, 1908, p. 284.
3. C. F. MeyerThe Diffraction of Light, X-Rays and Material Particles (Univ. Chicago Press), 1934, p. 251.
4. A. H. PfundJ.O.S.A., 1934,24, 121–241.
5. C. V. Raman and K. S. KrishnanProc. Roy. Soc., (A), 1927,116, 255–67.