1. Moffitt, W., Proc. U.S. Nat. Acad. Sci., 42, 736 (1956); Moffitt, W., Fitts, D. D., and Kirkwood, J. G., ibid., 43, 723 (1957).
2. Tinoco, jun., I., Woody, R. W., and Bradley, D. F., J. Chem. Phys., 38, 1317 (1963); Biopolymers, 1, 239 (1963).
3. Brahms, J., Mommaerts, W. F. H. M., and Sadron, C., C.R. Acad. Sci., Paris, 258, 2203 (1964); Brahms, J., J. Amer. Chem. Soc., 85, 2398 (1963); Nature, 202, 797 (1964).
4. Mason, S. F., J. Chem. Soc., 2071 (1954);
5. Chem. Soc. Spec. Pub. No. 3 (London), 139 (1955).