Akhylbek K. Kurishbayev, Valentina G. Chernenok, Grigoriy A. Zvyagin. Antropogenous Changes of Dark-Chestnut Soils of Northern Kazakhstan and Measures for their Improvement // IEJME - Mathematics education 2016. V 11, № 6 – Р. 1577-1590.
Kurishbayev A., Zvyagin, A., Yaroslavtseva N, Kogut B. The Agrogana transformation of organic matter of chernozems of Kazakhstan // Scientific Bulletin of Samara, Samara, 2016. - № 3 (16) – 35-39 pp
Vasilchenko N., Zvyagin, G. Application of poultry manure to improve the fertility of dark chestnut soils of Northern Kazakhstan // Fertility, Moscow, 2016. - Vol. 4. - № 91. – 23-26 pp.