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[2] 历代正闰考_百度百科 () https://baike.baidu.com/item/%E5%8E%86%E4%BB%A3%E6%AD%A3%E9%97%B0%E8%80%83/8450509?fr=aladdin
[3] Li dai zheng run kao : si juan | Library of Congress () https://www.loc.gov/item/2014514145
[4] Li dai zheng run kao : si juan - Juan 1 | Library of Congress () https://www.loc.gov/resource/lcnclscd.2014514145.1A001/?st=slideshow