1. Internal Rotation in Molecules, Ed. W. J. Orville-Thomas, Wiley Interscience, New York, 1974.
2. D. G. Lister, J. N. MacDonald, and N. L. Owen, Internal Rotation and Inversion, Academic Press, London, 1978.
3. M. Oki, The Chemistry of Rotation Isomers, Springer-Verlag, Berlin, 1993.
4. R. F. W. Bader, J. R. Cheeseman, K. E. Laidig, K. B. Wiberg, and C. Breneman, J. Am. Chem. Soc., 1990, 112, 6530.
5. I. A. Godunov and N. N. Yakovlev, Zh. Strukt. Khim., 1995, 36, 269 [Russ. J. Struct. Chem., 1995, 36, 238 (Engl. Transl.)].