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Once you've searched an index to find articles, you may need to use Get it at UC to link to a PDF or html file if the full text is not immediately available. Each database is a bit different, but a good rule of thumb is:
Primary sources in the physical sciences are documents that provide a description of the original research. They haven't been filtered by a second party (other than peer review) and they tend to come first in the publication cycle. A secondary source will contain commentary on or discussion of a primary source.