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.
Fontelo P, Nahin A, Liu F, Kim G, Ackerman MJ.Accessing MEDLINE/PubMed with Handheld Devices: Developments and New Search Portals. Proceedings of 38th Hawaii International Conference on System Sciences; 2005 Jan 3-6; Big Island, Hawaii; Track 6:158b. DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/HICSS.2005.64.
Fontelo P, Ackerman MJ, Kim G.Development of evidence-based medicine resources: Bridging clinical research to medical practice. In: Sprague RH, editor. Proceedings of the 37th Annual Hawaii International Conference on System Sciences (HICSS'04); 2004 Jan 5-8; Big Island, Hawaii; Track 6: 7 pages. IEEE Computer Society.
Marcelo A, Fontelo P, Parolan M, Cualing H.Effect of Image Compression on Telepathology; A Randomized Clinical Trial. AMIA Annu Symp Proc; 2000 Nov 4-8; Los Angeles. p. 354-8.