fetch_scielo_results    Fetch search results from SciELO
normalize_categories    Normalize and validate a subject category
normalize_collections   Normalize SciELO collection names or ISO codes
normalize_journals      Normalize and validate a journal name
normalize_languages     Normalize and validate article language codes
search_scielo           Search SciELO and return results as a
                        data.frame
years                   Validate year range for SciELO query
