Keeping research in contact with the literature: Citation indexes and beyond

The research man needs both to acquire specific information and to browse. The exponential growth of publication challenges old aids and makes additional demands upon new ones. The use of re-sorted lists of references, in the form of citation indexes, offers an effective way to deal with both obsolescence of subject classifications and exponential growth. At a later stage, citation indexes can become essential parts of even more effective ways of connecting the research man to the literature.