About Unpaywall | Basic usage | What's returned? | Any API restrictions? | Keeping track of crawling | References

Preparing proper review graphs with epmc_hits_trend() | Use Cases | Use Case: Growth of Open Access Literature | Use Case: Cited open source software in scholarly publications | How to query Europe PMC? | Discussion and Conclusion | Conclusion | Acknowledgements

What is searched? | How to search Europe PMC with R? | Free search | Managing search results | Search by DOIs | Output options | More advanced options to search Europe PMC | Author search | Annotations | Data integrations | Citations and reference sections | Fulltext access