Calculation of the Transfer Function of a Power Transformer with Online Measuring Data. 2004. [PUMA: (TF) function measurement online overvoltages transfer transformer transient] URL
Transformer Modelling Based On Frequency Response Measurements For Winding Failure Detection. 2010. [PUMA: Analysis Fitting Frequency Function High Modeling Power Reponse Resonance Transfer Transformer Transient Vector] URL