时间序列数字滤波后自由度的确定--应用于日长变化与南方涛动指数的相关分析
시간서렬수자려파후자유도적학정--응용우일장변화여남방도동지수적상관분석
The Determination of Degrees of Freedom for Digital Filtered Time Series ——An Application in the Correlation Analysis between Length of Day Variation and SOI
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