1. A. I. Tentsova and I. S. Azhgikhin, Drug Form and Therapeutic Effectiveness of Drugs [in Russian], Moscow (1974).
2. Yu. N. Sheinker and I. Ya. Postovskii, Zh. Fiz. Khim.,31, 1745–1755 (1957).
3. Yu. N. Sheinker and I. K. Kuznetsova, ibid., pp. 2656–2662.
4. M. Kuhnert-Brandstatter and F. J. R. Bachleitner-Hofman, Spectrochim. Acta, Pt. A,27, 191–198 (1971).
5. F. V. Babilev and I. Ya. Andronik, Polymorphism of Drugs [in Russian], Kishinev (1981), pp. 149–172.