1. M. D. Mashkovskii, Drugs. 8th Edition [in Russian], Moscow (1977), Vol. 1, pp. 399–402; Vol. 2, pp. 132–133.
2. G. K. Nikonov, Aptech. Delo, No. 3, 62–70 (1965).
3. G. A. Kuznetsova, Natural Coumarins and Furocoumarins [in Russian], Leningrad (1967), pp. 14–28.
4. A. V. Ananichev, A. I. Ban'kovskii, and P. M. Loshkarev, Tr. Vses. Nauch.-Issled. Inst. Lek. Aromat. Rast., No. 15, 596–617 (1969).
5. é. P. Kemertelidze and V. P. Georgievskii, Physicochemical Methods of Analysis of Some Biologically Active Substances of Vegetable Origin [in Russian], Tbilisi (1976), pp. 149–198.