read_bibliography	import bibliography
write_bibliography	export bibliography
as.data.frame		convert an object of class ‘bibliography’ to a data.frame
find_duplicates	identify duplicated references within a data.frame
extract_unique_references	pull out one example of each unique reference
make_DTM	construct a document term matrix from a data.frame
run_LDA	wrapper function to topicmodels::LDA and related methods
start_review_window	draw an interactive plot of bibliographic data