Dinh , D. H., M. Q. Nguyen, T. G. Pham, L. Hoang, T. T. H. Le, T. V. N. Cu, X. S. Pham, L. A. Nguyen, N. C. Ho, T. S. Pham, Q. H. Nguyen, and T. N. Tran. “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, Vol. 10, Nov. 2022, pp. 19 -27, doi:10.47800/PVJ.2022.10-03.