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Multiple time scale correlations between sunspots and droughts/floods in the Upper Hanjiang River and northern North China
ZHANG Xiaodan, YANG Yuda, REN Guoyu, YANG Guowei, HE Yuan
Acta Geographica Sinica . 2025, (7): 1721 -1739 .  DOI: 10.11821/dlxb202507001