倒三角算符 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "倒三角算符" in Chinese language version.

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  • 史天治.狭义del算子与符号运算法[J].河南教育学院学报(自然科学版),2007(4):16-19.维普网.

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book.sciencereading.cn

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