1. Alekin, O.A., Osnovy gidrokhimii (Foundations of Hydrochemistry), Leningrad: Gidrometeoizdat, 1970.
2. Vorob’eva, L.A., Khimicheskii analiz pochv (Soil Chemical Analysis), Moscow: Mosk. Gos. Univ., 1998.
3. Karavanova, E.I. and Belyanina, L.A., Composition of Soil Solutions in Main Types of Soils in Central Forest State Natural Biosphere Reserve, Vestn. Mosk. Univ., Ser. 17, Pochvoved., 2007, no. 2, pp. 23–29.
4. Kaurichev, I.S., Nozdrunova, E.M., and Evseeva, R.P., Water-Soluble Aluminum in Soils of Taiga Zone, Izv. Timiryazevsk. S-Kh. Akad., 1968, no. 6, pp. 145–151.
5. Kislotnye osadki i lesnye pochvy (Acid Precipitation and Forest Soils), Apatity, 1999.