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2. Saturation time of transformers under dc excitation;Bolduc;Electric Power Systems Research,2000
3. Calculation models for estimating DC currents impact on power transformers;Egorov,2007
4. Investigation of GIC related effects on power transformers using modern diagnóstic methods;Heindl,2011
5. GIC occurrences and GIC test for 400kV system transformer;Lahtinen;IEEE Transactions on Power Delivery,2002