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Dinh , D.H., Nguyen, M.Q., Pham , T.G., Hoang , L., Le, T.T.H., Cu , T.V.N., Pham , X.S., Nguyen , L.A., Ho , N.C., Pham , T.S., Nguyen , Q.H. and Tran , T.N. 2022. A successful pilot application of the complex mixture surfactant polymer VPI SP to enhance oil recovery factor for the Lower Miocene, Bach Ho field. Petrovietnam Journal. 10, (Nov. 2022), 19 - 27. DOI:https://doi.org/10.47800/PVJ.2022.10-03.