You've searched the databases! Congratulations! To achieve comprehensiveness, you've now got to consider strategies to supplement your database searching—other ways of searching, and other places to search.
Articles that are nodes of key research are called citation pearls, since they are a rich source of other citations. You can also use a citation pearl as a source of keywords or relevant subject headings.
Scopus and Web of Science are two databases that have this 'citing reference' feature. Citation Chaser is a tool which provides similar features, finding the articles that cite and are cited by your articles (i.e., citation pearls). Scopus and Citation Chaser, two options for reference tracking, are discussed below.
Check out the video below for instructions on using Scopus to automatically locate and export references of your included articles:
Citation Chaser is an automated tool that retrieves articles that cite and are cited by your articles (i.e., citation pearls). As a single-purpose tool, Citation Chaser limits itself to reference tracking, making it easy to use. Citation Chaser searches the Lens.org database, which includes PubMed, PubMed Central, CrossRef, Microsoft Academic Graph, and CORE, to find articles. With Citation Chaser:
The following steps outline how to use Citation Chaser:
There are two good reasons to search other places (besides library databases) for evidence in a comprehensive search:
1. Find references to key studies your database searching may have missed by reading (for example):
2. Find studies, programs, or reports that aren't published in scientific journals or books by searching for (for example):
Many of these sources and documents are considered "grey literature". Whether you cite these sources as evidence, or they point you to evidence in the published literature is often based on contextual factors specific to your research. A librarian can help you figure it out. We've made things a bit easier by compiling key sources for grey literature, which you'll find on the left-hand side of this guide.
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