1. State Pharmacopeia of the USSR [in Russian], 10th ed. (1968), p. 750.
2. International Pharmacopeia [Russian version], Moscow (1969), p. 770.
3. The Pharmacopeia of the United States of America, Easton (1970), p. 894.
4. British Pharmacopeia, London (1968).
5. Y. I. C. Cohen, in: Radioactive Pharmaceuticals. Proceedings of a Symposium held at the Oak Ridge Institute of Nuclear Studies of Operating Unit of Oak Ridge Associated Universities, Washington (1965), p. 67.