There are many ways to obtain the data of academic papers. Here are some common methods:

1. Use document management software: Document management software can help you organize and manage a large number of academic papers. For example, EndNote, Mendeley and Zotero are all very popular literature management software. PDF files of papers can be imported into these softwares, and then classified, annotated and cited.

2. Use academic search engines: Academic search engines can help you find relevant academic papers quickly. For example, GoogleScholar, PubMed and IEEEXplore are all very popular academic search engines. You can enter keywords on these websites,

3. Use databases: Many university libraries subscribe to various academic databases, which contain a large number of academic papers. For example, JSTOR, ScienceDirect and SpringerLink are all very popular academic databases. You can log on to the website of your school library and then use your student account to access these databases.

4. Use a preprint server: A preprint server is a website that stores academic papers that have not been peer-reviewed. For example, arXiv, bioRxiv and SSRN are all very popular preprint servers. You can find the latest research results on these websites.