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4. Classification of the Conditions of Transformer Insulation Based on the Parameters of Partial Discharges, http://forca.ru/spravka/spravka/klassifikaciya-sostoyaniya-izolyacii-transformatorov-po-parametram-chistichnyh-razryadov.html .
5. A. S. Karandaev, S. A. Evdokimov, O. I. Karandaeva, et al., “Monitoring of the technical condition of power transformers by the method of acoustic diagnosis,” Vest. Yuzh.-Ural. Gos. Univ., Ser. Energet., No. 26 (126), 26–31 (2008).