itle: “Mining the citation network”
utput: rmarkdown::html_vignette
ignette: >


Article metadata was extracted from Elsevier API using each article’s DOI. The metadata contains the citing literature and the author-defined keywords. The citing literature is used to build a citation network. Keywords are used to augment the labels of country location derived from the human-reading. This is done by looking for regular expression of the name of the 23 target countries.

Minig the citation network

The following chunk extracts the cited and citing literature from the webscrapped metadata. This chunk is not run as it requires some licensed information.

citingFile <- "citing_df.Rds"
if (!file.exists(citingFile)){
    # get wosFullResult
    wosFullResult <- readRDS("./data/wosFullResult.Rds")
    # get source id
    source_ids <- lapply(wosFullResult, get_sourceID)
    # get citing cited
    citing_dfs <- lapply(wosFullResult, get_citing)
    citing_dfs <- na.omit(citing_dfs)
    citing_df <-, citing_dfs)
    citing_df <- citing_df[which(citing_df$cited %in% source_ids), ]
    saveRDS(citing_df, citingFile)
    saveRDS(source_ids, "source_ids.Rds")
} else {
    citing_df <- readRDS(citingFile)