Nasiyev B.N., Manolov I.G., и Bekkaliyev A.K. «CHANGE OF PHOSPHORUM AND EXCHANGE SODIUM CONDITIONS OF CHESTNESS SOILS UNDER THE INFLUENCE OF GRAZING». «Вестник НАН РК», вып. 2, апрель 2020 г., сс. 53-61, http://89.250.84.46/bulletin-science/article/view/779.