PMID (PubMed ID) is the unique identifier for a publication's abstract in PubMed.
PMCID (PubMed Central ID) is the unique identifier for a free complete article (once it is publicly available) in PubMed Central.
PubMed and PubMed Central, produced by the U.S. National Library of Medicine, are text archives of biomedical and life sciences literature.
A DOI (Digital Object Identifier) is a publisher’s unique identifier for a publication. The prefix http://dx.doi.org/ is presumed. Publishers may charge for access.
Lu CJ, Bangalore A, Tse T.Developing Web Browser Recording Tools Using Server-Side Programming Technology. Proc. of WebNet 2000, World conference on WWW and Internet: Association for the Advancement of Computing in Education. 2000;:372-7.
McCray AT, Gallagher ME, Flannick MA.Extending the role of metadata in a digital library system. In: Proceedings of the IEEE Forum on Research and Technology Advances in Digital Libraries, pp. 190-9, 1999.
Cooper GF, Buchanan BG, Kayaalp M, Saul M, Vries JK.Using computer modeling to help identify patient subgroups in clinical data repositories. Proc AMIA Symp. 1998:180-4.