1. R. G. Glushkov, M. D. Mashkovskii, G. K. Skryabin, et al., Khim.-farm. Zh., No. 6, 18–21 (1992).
2. R. S. Livshits, G. I. Bazilevskaya, et al., Zh. Obshch. Khim.,17, 1674 (1947).
3. V. A. Thachuk and T. N. Baldenkov, Biokhimiya,43, No. 6, 1097–1110 (1978).
4. Patent 3,311,654, USA (1967). Chem. Abstr.,67, No. 2754f (1967).
5. R. G. R. Bacon and W. J. W. Hanna, J. Chem. Soc., 4962–4968 (1965).