1. Monitoring of Power Transformer using Transfer Function Method;Leibfried;IEEE Trans. Power Deliv.,1999
2. K. Feser, J. Christian, T. Leibfried, A. Kachler, C. Neumann, U. Sundermann, M. Loppacher, The transfer function method for detection of winding displacements on power transformers after transport, short circuit or 30 years of service, CIGRE (2000) session.
3. Detecting transformer winding damage—the low voltage impulse method;Lech;Electr. Rev.,1966
4. Transformer diagnostic testing by frequency response analysis;Dick;IEEE Trans. Power Appar. Syst.,1978
5. Impulse testing of power transformer using transfer function method;Malewski;IEEE Trans. Power Deliv.,1988