1. Budzikiewicz, H., C. Djerassi and D.H. Williams, “Mass Spectrometry of Organic Compounds,” Holden-Day, San Francisco, 1967.
2. Zaretiskii, Z.V., “Mass Spectrometry of Steroids,” John Wiley & Sons, New York and Israel University Press, Jerusalem, 1976.
3. Unruh, G.V. and G. Spiteller, Tetrahedron 26:3329 (1970).
4. Munson, M.S.B. and F.H. Field, J. Am. Chem. Soc. 88:2621 (1966).
5. Field, F.H., in “Ion Molecule Reaction,” edited by J.L. Franklin, Plenum Press, New York, 1972, p. 133.