Cooper, G.R.J., 2009, Wavelet-based semblance filtering. Computers and Geosciences, 35, 1988-1991.
Cryer J.D. and Chan K.-S., 2010, Time series analysis: With application in R. Springer, New York, USA, 491 p.
Harada, M., Hattori, K., and Isezaki, N., 2004, Transfer function approach to signal discrimination of ULF geomagnetic data. Physics and Chemistry of the Earth, 29, 409-417.
Hatorri, K., Takahashi, I., Yoshino, C., Nagao, T., Liu, J.Y., and Shieh, C.F., 2002, ULF Geomagnetic and Geopotential measurement at Chia-Yi, Taiwan. Journal of Atmospheric Electricity, 22, 217-222.
Hattori, K., I. Takakhashi, C. Yoshino, N. Isezaki, H. Iwasaki, M. Harada, K. Kawabata, E. Kopytenko, P. Maltsev, V. Korepanov, O. Molchanov, M. Hayakawa, Y. Noda, T. Nagao, and S. Uyeda, 2004. ULF geomagnetic field measurements in Japan and some recent results associated with Iwateken Nairiku Hokubu Earthquake in 1998. Physics and Chemistry of the Earth, 29, 481-494.
Hayakawa, M., Itoh, T., Hattori, K., and Yumoto, K., 2000, ULF electromagnetic precursors for an earthquake at Biak, Indonesia on February, 17, 1996. Geophysical Research Letters, 27, 1531-1534.
Hayakawa, M., K. Hattori, and K. Ohta, 2007. Monitoring of ULF (ultra-low-frequency) geomagnetic variation associated with earthquakes, Sensors, 7(7), 1108-1122.
Johnston, M., 1997, Review of electric and magnetic fields accompanying seismic and volcanic activity. Surveys in Geophysics, 18, 441-475.
Kawate, R., Molchanov, O.A., and Hayakawa, M., 1998, Ultra-low-frequency magnetic fields during the Guam earthquake of 8 August 1993 and their interpretation. Physicsof the Earth and Planetary Interiors, 105, 229-238.
Nordemann, D.J.R., Rigozo, N.R., Souza Echer, M.P., and Echer, E., 2008, Principal components and iterative regression analysis of geophysical series: Application to Sunspot number (1750-2004). Computers and Geosciences, 34, 1443-1453.
Oh, S., Yang, J., Lee, D.-K., and Nam, J.-C., 2002, Geomagnetic depth sounding to investigate the trend of electrical conductivity in and around the Korean peninsula. Economic and environmental geology, 35, 437-444. (in Korean)
Oh, S., 2009, Variation analysis of geomagnetic data observed around the event of Andong earthquake (May 2, 2009). Journal of the Korean Earth Science Society, 30, 683-691. (in Korean)
Oh, S., 2012. Geomagnetic variation and its relation to microearthquakes in the seismically inactive Korean peninsula. Geoscience Journal, 16(1), 47-58.
Oh, S. and Ji, Y., 2014, Analysis of Geomagnetic Variations Related to Earthquakes Occurred in and Around the Korean Peninsula form 2009 until 2011. Journal of the Korean Earth Science Society, 30, 429-438. (in Korea)
Rikitake, T. and Honkura, Y., 1985, Solid earth geomagnetism. Terra Science Publish, Tokyo, Japan, 384 p.
Strangand, G. and Nguyen, T., 1996, Wavelets and Filter banks. Wellesley-Cambridge Press, Wellesley, USA, 490 p.
von Frese, R.R.B., Jones, M.B., Kim, J.W., and Kim, J.H., 1997, Analysis of anomaly correlations. Geophysics, 62, 342-351.
Yang, J., Oh, S., Lee, D.-K., and Youn, Y.-H., 2002, A study on the difference arrow of GDS (Geomagnetic Depth Sounding) survey using 2-D MT (Magneto-Telluric) modeling. Economic and environmental geology, 35, 567-573. (in Korean)
Yang, J., Lee, D.-K., Kwon, B.-D., and Youn, Y.-H., 2004, On the temporal variability geomagnetic field and transfer function at Icheon observatory. Journal of the Korean Earth Science Society, 25, 604-614. (in Korean)
Yang, J., Lee, H., and Oh, S., 2009. A study on temporal variations of geomagnetic transfer functions and polarization values obtained at cheongyang geomagnetic observatory, Journal of Korean Earth Science Society, 30(7), 824-833. (in Korean)