1. Krasochkin, V.T. and Stankevich, A.K.,Stolovaya svekla (Red Beet), Leningrad: Kolos, 1969.
2. Filonov, M.,Kartofel’i Ovoshchi, 1990, no. 6, p. 38.
3. Sinyakov, A.F.,Kartofel’i Ovoshchi, 1995, no. 1, p. 1.
4. Zakharova, N.S. and Petrova, T.A.,Prikl. Biokhim. Mikrobiol., 1998, vol. 34, no. 2, pp. 199–202.
5. Bokuchava, M.A., Pruidze, G.N., and Ul’yanova, M.S.,Biokhimiya proizvodstva rastitel’nykh krasitelei, (Biochemistry of the Industry of Plant Pigments), Tbilisi: Metsniereba, 1976.