Citation indexes are a unique kind of reference database that identifies and groups together all newly published articles that have referenced (cited) the same earlier publication. Citation indexes limit entries to references in published research, both journals and books, but are quite exhaustive within these categories.
Academia houses a great deal of potentially valuable but largely unpublished material in the form of doctoral dissertations and masters' theses. Although many reference databases contain abstracts of dissertations, Dissertation Abstracts focuses exclusively on them. Both the printed and the computerized versions include records dating back to 1861. Increasingly, the full text can be purchased and printed. Alternatively, you may need to use interlibrary loan services to obtain a photocopy from the university at which the dissertation research was conducted.
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