1. J. P. Hailman, in “Optical Signals: Animals Communication and Light”, Indiana Univ. Press, Bloomington and London (1977).
2. R. K. Clayton, in “Light and Living Matter: The Biological Part” McGraw-Hill, New York, N.Y. (1971).
3. D. F. Walls, Nature 280:451 (1979).
4. W. H. Klein, quoted by W. Shropshire, Jr., in “The Science of Photobiology”, K. C. Smith, ed., Plenum Press, New York, N. Y. (1977).
5. W. A. Shurcliff, “Polarized Light: Production and Use” Harvard Univ. Press, Cambridge, Mass. (1962).