Cited reference searching can be used to find out if an article, book, journal, or particular author has been cited by another work.
PubMed comprises more than 29 million citations for biomedical literature from MEDLINE, life science journals, and online books. Items that have been cited include a "Cited By" section.
Journal rankings and impact factors are quantitative measures for evaluating the performance of a journal in its field. Measuring journal impact is not an exact science and should be used with an understanding of its limitations and challenges.
CiteScore Metrics - CiteScore is based on the number of citations received in previous 4 years to 5 peer-reviewed document types (articles, reviews, conference papers, data papers, and book chapters) by a journal in the same four years, divided by the number peer-reviewed documents indexed in Scopus and published in those same four years.
Eigenfactor and Article Influence -eigenfactor.org ranks the influence of journals and articles much as Google’s PageRank algorithm ranks the influence of web pages. By this approach, journals are considered to be influential if they are cited often by other influential journals
Journal Citation Reports (JCR) (Subscription access/not available at WPI) -Evaluates and compares journals using citation data drawn from the Web of Knowledge/Web of Science scholarly and technical journals. Shows most frequently cited and highest impact journals in a given field.
SNIP - SNIP (Source Normalized Impact per Paper ) uses Scopus data and measures contextual citation impact by weighting citations based on the total number of citations in a subject field. "SNIP therefore measures contextual citation impact and enables direct comparison of journals in different subject fields, since the value of a single citation is greater for journals in fields where citations are less likely, and vice versa."