1. Binks, R., Cleaver, R. L., Littler, J. S., and Macmillan, J., Chemistry in Britain, 7, 8 (1971); Smith, D. A., Olsen, R. W., Walls, F. C., and Burlingame, A. L., Anal. Chem., 43, 1796 (1971).
2. Hites, R. A., and Biemann, K., Anal. Chem., 40, 1217 (1968).
3. Sweeley, C. C., Ray, B. D., Wood, W. I., Holland, J. F., and Kricheosky, M. I., Anal. Chem., 42, 1505 (1970).
4. Henneberg, D., and Schomberg, G., Advances in Mass Spectrometry, 5 (Institute of Petroleum, London, in the press).
5. Biemann, K., and McMurray, W. J., Tetrahedron Lett., 647 (1965).