1. Efficiency of irrigation in steppe dry regions of Northern Kazakhstan;V. M. Borovskoi,1977
2. A. N. Buneev, Fundamentals of Hydrochemistry of Mineral Waters of Sedimentary Deposits (Medgiz, Moscow, 1956) [in Russian].
3. N. I. Gorbunov, Soil Colloids and Their Role in Soil Fertility (Nauka, Moscow, 1967) [in Russian].
4. N. I. Gorbunov, Mineralogy and Colloid Chemistry of Soils (Nauka, Moscow, 1974) [in Russian].
5. Soils of Kenya, Tanzania, and Uganda and their geochemical features;V. V. Dobrovol’skii,1973