1. K. A. Petrov and L. A. Andreev,Usp. Khim., 1971,XI, 1014 [Russ. Chem. Rev., 1971, No. 6 (Engl. Transl.)].
2. B. Milligan and J. M. Swan,J. Chem. Soc., 1961, 1194.
3. R. Taylor, O. Kennard, and W. Versichel,Acta Crystallogr., Sect. B, 1984,40, 280.
4. L. N. Kuleshova and P. M. Zorkii,Acta Crystallogr., Sect. B, 1981,37, 1363.
5. Yu. V. Zefirov and P. M. Zorkii,Zh. Struct. Khim., 1976,17, 994 [J. Struct. Chem., 1976,17 (Engl. Transl.)].