query: #scientific papers without description in English
  SELECT DISTINCT ?item ?itemLabel
  WHERE
  {
    { ?item wdt:P31 wd:Q13442814 . } 
    OPTIONAL { ?item schema:description ?itemDescription  }
    FILTER (!BOUND(?itemDescription))
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en"}
  }
  LIMIT 1000