1. M. D. Mashkovskii, Medicinals [in Russian], 8th edn., Part 1, Moscow (1977), pp. 341–342.
2. N. I. Libizov and G. N. Vlasova, USSR Inventor's Certificate No. 205228; Izobret., No. 23, 81 (1967).
3. D. Gabar, Vengersk. Med., No. 23, 81 (1965).
4. G. Galosh, ibid., No. 23, 53–56 (1967).
5. U. Soffler, A. E. Essellier, and I. Forster, Schweiz. Med. Wschr.,83, 24–41 (1953).