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* PaperDay标准版不限次数旗舰版每天1000-1010免费一次
https://www.paperday.cn/
## 收费
* 维普
3元/千字
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## 英文论文
* Turnitin
## 免费/收费论文查询
* scihub
https://sci-hub.se/
https://sci-hub.ru/
* Crossref
该数据库包含超过 1.2 亿条记录及 API可以通过 torrents 下载
https://www.crossref.org/
* General Index
该数据库可以索引到1.07亿篇学术论文
https://archive.org/details/GeneralIndex
* OpenCitations Corpus
https://opencitations.net/corpus
* Scopus
不是免费的