api_key = get_api_key(NULL, error = FALSE)
if (!is.null(api_key)){
x = abstract_retrieval("S1053811915002700", identifier = "pii",
verbose = FALSE)
res = bibtex_core_data(x)
cat(res)
x = abstract_retrieval("84929707579", identifier = "scopus_id",
verbose = FALSE)
res2 = bibtex_core_data(x)
cat(res2)
}
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