1. (a) G.A. Olah, in Friedel–Crafts and Related Reactions, G.A. Olah (Ed.), Wiley-Interscience, New York, 1963, Vol. 1, p. 25;
2. (b) S.H. Patenkin and B.S. Friedmann, in Friedel–Crafts and Related Reactions, G.A. Olah (Ed.), Wiley-Interscience, New York, 1964, p. 1;
3. (c) F.A. Drahowzal, in Friedel–Crafts and Related Reactions, G.A. Olah (Ed.), Wiley-Interscience, New York, 1964, Vol. 2, p. 417.
4. D.M. Brouwer, E.L. Mackor, C. McLean, in Carbonium Ions, G.A. Olah, P.V.R. Schleyer (Eds.), Wiley, New York, 1970, Vol. 2, p. 837.
5. Chemical Ionization Mass Spectrometry. IV. Aromatic Hydrocarbons