1. K. K. Medne, Proceedings of the Meeting on the Current Problems in the Search for and Characterization of New Drugs [in Russian], Riga (1959), p. 53.
2. I. S. Berdinskii, L. V. Sennitskaya, and L. F. Chereshneva, Khim.-Farm. Zh., 7(1), 10–14 (1973).
3. C. Marcu, V. Bratu, M. Manuckian, et. al., Farmacia (RPR), 11(10), 617–623 (1963).
4. V. P. Chernykh, N. N. Valyashko, T. S. Dzhan-Temirova, et al., Khim.-Farm. Zh., 6(7), 8–10 (1972).
5. K. K. Medne, Izv. Akad. Nauk. Latv. SSR, No. 12, 119–123 (1967).