1. N. N. Sharakhimov, “Harmal (Peganum harmala L.). Its biological characteristics and value as a drug,” Author's Abstract of Candidate's Dissertation, Tashkent (1975).
2. Atlas of the Areas and Resources of Medicinal Plants of the USSR [in Russian], Vol. 34, Moscow (1976), p. 218.
3. Flora of the USSR [in Russian], Vol. 19, Moscow-Leningrad (1953), p. 146.
4. Abu Ali Ibn Sina [Avicenna], Canon of Medical Science [Russian translation], Book 2, Tashkent (1956).
5. V. S. Sokolov, Alkaloid-Bearing Plants of the USSR [in Russian], Moscow-Leningrad (1952), pp. 230, 288.