A citation index will search not only article titles and abstracts, but also their bibliographies. You can also use it to find articles that cite a particular work, thus tracing a research topic forward in time. Two of the best citation trackers are listed below: Scopus, and the Web of Science. Both cover all of the sciences and social sciences with powerful search tools.
Citation database of peer-reviewed literature: scientific journals, books and conference proceedings.
Covers the fields of science, technology, medicine, social sciences, and arts and humanities. Comprised of 21,000 titles from more than 5,000 international publishers. Exporting data to Reference Managers such as Mendeley, RefWorks and EndNote, tracking citations with Citation Overview/Tracker, analyzing journal performance with Journal Analyzer and alternative journal impact metrics SNIP and SJR are some of its unique features.