Tran, T., Do, K., La, N. and Luu, T. (2018) “Study on the structure of polymer electrolyte membrane using small angle X-ray scattering and positron annihilation spectroscopy”, Science & Technology Development Journal: Natural Sciences, 1(6), pp. 197-205. doi: https://doi.org/10.32508/stdjns.v1i6.630.