Tran, M., Huynh, H., Le, V., & Ngo, T. (2016). Synthesis and characteristics of La0.6Sr0.4Co0.2Fe0.8O3-δ perovskite cathode material by microwave assisted sol – gel method. Science and Technology Development Journal, 19(3), 41-49. https://doi.org/https://doi.org/10.32508/stdj.v19i3.584