query: #scientific papers without description in English
  SELECT DISTINCT ?item ?itemLabel ?pubdate
  WHERE
  {
    { ?item wdt:P31 wd:Q13442814 . } 
    OPTIONAL { ?item schema:description ?itemDescription  }
    FILTER (!BOUND(?itemDescription))
  #  { ?item wdt:P577 ?pubdate . } #useful if "scientific article" is already used as a description of another item with the same label 
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en"}
  }
  LIMIT 1000