There are many primary sources of information in physics such as journal articles. Indeed the problem is to find just what you want among this mass of information. Fortunately there are tools that make this task easier. Information from primary sources has been collected together and organised under subject headings and authors in reference databases. These can be used directly for online searching or for the production of a searchable compact disk CD-ROM database or for the printing of secondary publications called Abstracts and Indexes . These are published at regular intervals - weekly, monthly or quarterly and are usually brought together, or cumulated, annually or for even longer intervals.
Physics Databases
Database Searching (Online information retrieval)
Online Database Demonstrations