1. Wang, R., Jiang, T.: Analysis of major natural disasters in the twentieth century. J. Nat. Disasters 9(4), 9–15 (2000)
2. Niwa, S., Yasukawa, H., Takumi, I., et al.: The precursor signal detection from electromagnetic waves for predicting great earthquakes using Kalman filter. In: Geoscience and Remote Sensing Symposium, 2003. IGARSS ‘03. Proceedings. 2003 IEEE International, pp. 3620–3622 (2003)
3. Yasukawa, H., Niwa, S., Hata, M., et al.: In: Signal Processing Conference, 2002 11th European. IEEE, pp. 1–4 (2002)
4. Lian, Y.: Research on denoising wavelet packet transform to signal based on electric field. Northeast Agricultural University, Harbin (2014)
5. Sharma, G.K., Bhagi, S., Thirunavukkarasu, S., et al.: Wavelet transform-based approach for processing ultrasonic B-scan images. Insight Non-Destruct. Test. Cond. Monit. 59(2), 93–99 (2017)