1. Atkins, W. R. G. and Poole, H. H. “The photoelectric measurements of the penetration of light of various wavelengths into the sea and the physiological bearing of the results,”Phil. Trans. Roy. Soc., 1933,222 B, 129–64.
2. Clerke, George, L... “Light penetration in the Western North Atlantic and its application to biological problems,”Rapports et Proces-Verbaux. Con. Perm. Intern. Exp. Mer., 1936,101, Pt. 2, e3–14.
3. —————.. “Light penetration in the Gulf of Mexico,”Journ. Mar. Res., 1938,1, 85–94.
4. —————.. “Observations on transparency in the South-Western Section of the North Atlantic Ocean,” Ibid., 1938,1, 85–94.
5. —————.. “Observations on transparency in the South-Western Section of the North Atlantic Ocean,” Ibid., 1941,4, 221–30.