Research on equivalence and application characteristics of directed polygon's area formulas
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引用本文: | 张树森. 有向多边形面积公式的等价性与用特性研究[J]. 铁路计算机应用, 2013, 22(4): 7. |
Citation: | ZHANG Shusen. Research on equivalence and application characteristics of directed polygon's area formulas[J]. Railway Computer Application, 2013, 22(4): 7. |