L. Mamonov, V. Zavadskiy, B. Ponomarev, J. Vassilyev, V. Mursaliyeva, and N. Gemejiyeva, “Isolation and investigation extracts from raw material of tanniferous plants.”, Chemical Bulletin of Kazakh National University, vol. 65, no. 1, pp. 285-289, Dec. 2012.