1. G. I. Borodkin, Sh. M. Nagy, Yu. V. Gatilov, and M. M. Shakirov,Abstracts of Papers from the All-Union Conference on Diffraction Methods in Chemistry, Vol. 1, Suzdal (1988), p. 88.
2. V. A. Koptyug,Arenonium Ions. Structure and Reactivity [in Russian], Nauka, Novosibirks (1983).
3. G. I. Borodkin and V. G. Shubin,Usp. Khim.,64, No. 7, 672–703 (1995).
4. C. Baenziger and A. D. Nelson,J. Am. Chem. Soc. 90, No. 24, 6602–6607 (1968).
5. G. A. Olah and P. v. R. Schleyer (eds.),Carbonium Ions, Vol. 5, Wiley, New York (1976), p. 2427.