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Perform forward and backward citation chasing as part of an evidence synthesis project

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# citationchaser <img src="inst/extdata/citationchaser.png" align="right" width="15%"/>

In searching for research articles, we often want to obtain lists of references from across studies, and also obtain lists of articles that cite a particular study. In systematic reviews, this supplementary search technique is known as 'citation chasing': forward citation chasing looks for all records citing one or more articles of known relevance; backward citation chasing looks for all records referenced in one or more articles.

Traditionally, this process would be done manually, and the resulting records would need to be checked one-by-one against included studies in a review to identify potentially relevant records that should be included in a review.

This package contains functions to automate this process by making use of the Lens.org API. An input article list can be used to return a list of all referenced records, and/or all citing records in the Lens.org database (consisting of PubMed, PubMed Central, CrossRef, Microsoft Academic Graph and CORE; 'https://www.lens.org').

USERS MUST OBTAIN A TOKEN FOR THE LENS.ORG SCHOLARLY API (<a href="https://www.lens.org/lens/user/subscriptions#scholar" target="_blank">available for free here</a>). The API may be time limited, but not rate limited. Requests for tokens may need initial approval from The Lens.

***A shiny app version of the package is available [here](https://estech.shinyapps.io/citationchaser/). This version requires no Lens.org API and is immediately usable and ENTIRELY FREE.***

Install the package using the following code:
`devtools::install_github("nealhaddaway/citationchaser")`

Please cite as:<br>
Haddaway, N. R., Grainger, M. J., Gray, C. T. 2021. citationchaser: An R package and Shiny app for forward and backward citations chasing in academic searching. doi: <a href="https://doi.org/10.5281/zenodo.4543513" target="_blank">10.5281/zenodo.4543513</a><br>
<a id="raw-url" href="https://raw.githubusercontent.com/nealhaddaway/citationchaser/master/inst/shiny-examples/citationchaser/www/citation.ris">Citation in .ris format (right click 'Save Link As')</a>

[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.4543513.svg)](https://doi.org/10.5281/zenodo.4543513)

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