1. Abaturov, B.D., Fekadu, Kassaye., Kuznetsov, G.V., Magomedov, M.-R.D., and Petelin, D.A., Nutritional estimate of populations of some wild free-ranging African ungulates in grassland (Nechisar national park, Ethiopia) in dry season, Ecography, 1995, vol. 18, no. 2, pp. 164–172.
2. Abaturov, B.D., Kolesnikov, M.P., Nikonova, O.A., and Pozdnyakova, M.K., Experience of quantitative assessment of nutrition of free-ranging mammals in their natural environment, Zool. Zh., 2003, vol. 82, no. 1, pp. 104–114.
3. Arasimovich, V.V. and Ermakov, A.I., Determination of polysaccharides and lignin, in Metody biokhimicheskogo issledovaniya rastenii (Methods of Biochemical Research of Plants), Leningrad: Agropromizdat, 1987, pp. 1–43.
4. Coppedge, B.R., Leslie, D.M., Shaw, J.R., and Shaw, Ja.H., Botanical composition of bison diets on tallgrass prairie in Oklahoma, J. Range Manage., 1998, vol. 51, no. 4, pp. 379–382.
5. Ely, R.E., Kane, E.A., Jacobson, W.C., and Moore, L.A., Studies on the composition of lignin isolated from orchard grass hay cut at stages of maturity and from corresponding feces, J. Dairy Sci., 1953, vol. 36, pp. 346–355.