1. V. I. Minkin, O. A. Osipov, and Yu. A. Zhdanov, Dipole Moments in Organic Chemistry [in Russian], Khimiya (1968), p. 75.
2. R. P. Arshinova, Usp. Khim.,46, 1544 (1977).
3. L. Pierce, R. G. Haues, and J. F. Beecher, J. Chem. Phys.,46, 4352 (1967).
4. É. A. Ishmaeva, Usp. Khim.,47, 1678 (1978).
5. A. L. McClellan, Tables of Experimental Dipole Moments, Vol. 1, San Francisco-London (1963); ibid., Vol. 2 (1974).