Kuspanova, B. 2011. “Prediction of Oil Reserves in Wells on the Basis of Studying the Content of Vanadium (IV) and Bivalent Manganese Mn2+ in Rocks”. Chemical Bulletin of Kazakh National University 64 (4), 157-62. https://doi.org/https://doi.org/10.15328/chemb_2011_4157-162.