query: ##defaultView:BubbleChart
  #Most cited authors who have published on Zika
  SELECT ?author ?authorLabel (COUNT(?publication) AS ?count)
  WHERE
  {
      ?item wdt:P2860 ?publication .
      { ?publication wdt:P921 wd:Q202864 . } UNION { ?publication wdt:P921 wd:Q8071861 . }
      ?publication wdt:P50 ?author .
      SERVICE wikibase:label {
          bd:serviceParam wikibase:language "en" .
      }
  }
  GROUP BY ?author ?authorLabel
  ORDER BY DESC(?count)