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Anomalies of the Geomagnetic Harmonic Wave Amplitude Ratio before the M
B
6.4 Deep Source Earthquake in Heilongjiang Province
LIU Changsheng，NI Xiaoyin，ZHOU Chen，ZHANG Mingdong， WANG Jianfeng，ZHAO Yi
jgg . 2019, (
3
): 290 -294 .
