1. Chandrasekhar, S.: 1950,Radiative Transfer, Oxford University Press, London.
2. Cox, C. and Munk, W.: 1954a,J. Opt. Soc. Amer. 44, 838.
3. Cox, C. and Munk, W.: 1954b,J. Mar. Res. 13, 198.
4. Cox, C. and Munk, W.: 1955,J. Mar. Res. 14, 63.
5. Elson, J. M.: 1976,J. Opt. Soc. Amer. 66, 682.