1. See, for example, Oster, G., and Mark, H., J. Opt. Soc. Amer., 43, 283 (1953).
2. See, for example, Klatte, F., and Muller, H., U.S. Pat. 1,920,403 (1933). Christ, R. E., Chem. and Indust., 59, 267 (1940). Burnett, G. M., and Melville, H. W., Proc. Roy. Soc., A, 189, 481 (1947).
3. Owens, J. S., U.S. Pat. 2,344,785 (1944). Baxendale, J. H., Evans, M. G., and Park, G. S., Trans. Farad. Soc., 42, 155 (1946). Evans, M. G., Santappa, M., and Uri, N., J. Polymer Sci., 7, 243 (1951).
4. Bamford, C. H., and Dewar, M. J. S., Symp. Soc. Dyers and Colourists (1949), 110. Whyte, R. B., and Melville, H. W., ibid., 119.
5. Oster, B., paper presented before the 122nd Annual Meeting of the Amer. Chem. Soc., Atlantic City, September 15, 1952.