Garcia, Belen; Cespedes, Alexander; Garcia, Diego: 'Moisture analysis for power transformers' (Energy Engineering, 2018), 'Power Transformer Condition Monitoring and Diagnosis', Chap. 3, pp. 87-123, DOI: 10.1049/PBPO104E_ch3
IET Digital Library, https://digital-library.theiet.org/;jsessionid=3ihl2si02aum3.x-iet-live-01content/books/10.1049/pbpo104e_ch3