Kuspanova B. 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 [Internet]. 1Dec.2011 [cited 5May2024];64(4):157-62. Available from: https://bulletin.chemistry.kz/index.php/kaznu/article/view/523