1. M. D. Mashkovskii, Medicinal Preparations [in Russian], Vol. 1, Meditsina, Tashkent (1989), p. 359.
2. Flora of Uzbekistan [in Russian], Vol. 4, Izd. Akad. Nauk Uzb. SSR, Tashkent (1959), p. 168.
3. S. A. Salikhov, Dye Plants for the Food Industry [in Russian], Tashkent, p. 57.
4. M. P. Filippov, Infrared Spectra of Pectinic Substances [in Russian], Shtiintsa, Kishinev (1978), p. 14.
5. State Pharmacopeia of the USSR, XIth Ed., Nos. 1 and 2, Meditsina, Moscow (1988).