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Anomalies of the Geomagnetic Harmonic Wave Amplitude Ratio before the MB6.4 Deep Source Earthquake in Heilongjiang Province
LIU Changsheng,NI Xiaoyin,ZHOU Chen,ZHANG Mingdong, WANG Jianfeng,ZHAO Yi
大地测量与地球动力学 . 2019, (3): 290 -294 .