Analysis of information sources in references of the Wikipedia article "电磁学" in Chinese language version.
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值 (帮助). Encyclopædia Britannica. [2009-08-25 }https://en.wikipedia.org/wiki/Intergalactic?wprov=sfla1%5D (英语). 存档副本. [2022-01-17]. 原始内容存档于2019-05-02.|url=
值 (帮助). Encyclopædia Britannica. [2009-08-25 }https://en.wikipedia.org/wiki/Intergalactic?wprov=sfla1%5D (英语). 存档副本. [2022-01-17]. 原始内容存档于2019-05-02.|url=
值 (帮助). Encyclopædia Britannica. [2009-08-25 }https://en.wikipedia.org/wiki/Intergalactic?wprov=sfla1%5D (英语). 存档副本. [2022-01-17]. 原始内容存档于2019-05-02.