1. Chen, M. S., and Yan, S., 1995, Problems on application of frequency soundings, Beijing: Geological Publishing House, 36–37.
2. Nabighian, M. N., 1992, Electromagnetic methods in applied geophysics, Volume 1, Theory. Society of Exploration Geophysics.
3. Kaufman, A. A., and Keller, G. V., 1983, Frequency and transient soundings, New York: Elsevier Science Publishing Company Inc., 545–551.
4. Li, X, 2002, Theory and application of transient electromagnetic method. Xi’an: Shaanxi science and Technology Press, 29–35.
5. Macnae, J., and Mutton, A., 1996, Can sulphides be discriminated from conductive states? A case history at Dugald River. Exploration Geophysics, 27(2/3), 119–130.