Pham , B. N., Nghiem , T. N., Dao, M. P., Nguyen, T. L. O., Ta, H. T., & Tran, L. C. (2021). Objective factors and policies of countries affecting hydrogen market development . Petrovietnam Journal, 12, 70 - 82. https://doi.org/10.47800/PVJ.2021.12-07