1. Andrews, D. H. Phys. Rev., 1930, 36, 544.
2. Westheimer, F. H.; Mayer, J. E. J. Chem. Phys.
1946, 14 733.
3. Hendrickson, J. B. J. Am. Chem. Soc.
1961, 83, 4537.
4. Wiberg, K. B. J. Am. Chem. Soc.
1965, 87, 1070.
5. Burkert, U.; Allinger, N. L. Molecular Mechanics, American Chemical Society, Washington, DC1982.