query: #articles Prof. Voit
  SELECT ?work ?workLabel ?count 
  WITH {
    SELECT (count(?citing_work) as ?count) ?work WHERE {
      ?work wdt:P50 wd:Q21256003 .
      OPTIONAL { ?citing_work wdt:P2860 ?work . }
    }
    GROUP BY ?work
  } AS %result
  WHERE {
    INCLUDE %result
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }        
  } ORDER BY DESC(?count)
  LIMIT 55