query: #Authors with initials instead of given names with
  #sitelinks to en.wikisource.
  
  #TODO: Use petscan to check these pages for existence
  #      of the {{initials}} template or their presence
  #      in the Authors with unidentified initials Category
  
  SELECT ?article WHERE {
  
    ?initials wdt:P31 wd:Q19803443.
    ?author wdt:P31 wd:Q5;
            wdt:P735 ?initials.
    ?link schema:about ?author.
    ?link schema:isPartOf <https://en.wikisource.org/>.
    ?link schema:name ?article
  
  
    SERVICE wikibase:label {
      bd:serviceParam wikibase:language "en"
    }
  }