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https://sourceforge.net/p/industry-reports-2018-part1/code/ci/master/tree/%E4%B8%AD%E5%9B%BD%E8%B7%A8%E5%A2%83%E6%94%AF%E4%BB%98%E8%A1%8C%E4%B8%9A%E4%B8%93%E9%A2%98%E7%A0%94%E7%A9%B62017-%E5%A4%96%E5%8F%91%E7%BB%88%E7%89%88V3.pdf?format=raw