query: SELECT ?item ?title ?pages (COUNT(?citations) AS ?count) WHERE {
    ?item wdt:P31 wd:Q13442814.
    ?item wdt:P1433 wd:Q1919514.
    ?item wdt:P478 "13".
    ?item wdt:P433 "6".
    ?item wdt:P1476 ?title.
    ?item wdt:P304 ?pages.
    optional {
      ?item wdt:P2860 ?citations.
    }
  } GROUP BY ?item ?title ?pages