Bagheri, Mehdi; Toan Phung, : 'Frequency response analysis' (Energy Engineering, 2018), 'Power Transformer Condition Monitoring and Diagnosis', Chap. 5, pp. 143-210, DOI: 10.1049/PBPO104E_ch5
IET Digital Library, https://digital-library.theiet.org/;jsessionid=8l69ddb5bkmf6.x-iet-live-01content/books/10.1049/pbpo104e_ch5