1. Walling, C. ..Free Radicals in Solution, John Wiley, and Sons, Inc. (Lond.), 1957, p. 157.
2. Scholfeld, E. and Waltcher, I.J. Polymer Sci., 1959,36, 536.
3. Saigusa, T. and Oda, R...Chem. Abstr., 1956,50, 1357;Bull. Inst. Chem. Res. Kyoto Chim., 1955,33, 126.
4. Smets, G. and Cleasan, M.J. Polymer Sci., 1952,8, 289.
5. O’Brien, J. L. and Gornick, F.J. Amer. Chem. Soc., 1955,77, 4757.