1. R. P. Kohin, dissertation, University of Maryland, College Park, Md., 1961;
2. R. P. Kohin and R. S. Anderson, Bull. Am. Phys. Soc. 6, 247 (1961).BAPSA60003-0503
3. D. Pooley and D. H. Whiffen, Spectrochim. Acta 18, 291 (1962); SPACA50038-6987
4. D. H. Whiffen, in Free Radicals in Biological Systems, M. S. Blois, Ed. (Academic Press Inc., New York, 1961), p. 227.
5. M. Kashiwagi, Bull. Chem. Soc. Japan 39, 2051 (1966).BCSJA80009-2673