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* PaperDay(标准版:不限次数,旗舰版:每天10:00-10:10免费一次)
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https://www.paperday.cn/
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## 收费
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* 维普
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3元/千字
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## 英文论文
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* Turnitin
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## 免费/收费论文查询
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* scihub
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https://sci-hub.se/
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https://sci-hub.ru/
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* Crossref
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该数据库包含超过 1.2 亿条记录及 API,可以通过 torrents 下载
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https://www.crossref.org/
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* General Index
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该数据库可以索引到1.07亿篇学术论文
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https://archive.org/details/GeneralIndex
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* OpenCitations Corpus
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https://opencitations.net/corpus
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* Scopus
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不是免费的
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