Pham, Khoi. “Measurement -Based Electrical Parameters of Power Transformers for Frequency Response Analysis Interpretation - Part I: Core Analysis”. Science and Technology Development Journal 20, no. K3 (June 30, 2017): 5-10. Accessed November 23, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/1074.