Can I look up articles by digital object identifier (DOI) or PubMed Identifier (PMID)?

Yes, LibKey.io allows you to access journal articles using either the digital object identifier (DOI) or PubMed Identifier (PMID). If the article is available through the Library or via Open Access, you will be able to access the PDF or the article link: https://www.bristol.ac.uk/library/find/access-eresources/libkeyio/