query: # most frequent Wikimedia import sources (P143 values)
  # query by Jura1, 2019-06-24
  #defaultView:BubbleChart
  SELECT ?item ?itemLabel ?ct 
  WHERE
  {
    {
      SELECT ?item (count(*) as ?ct)
      WHERE
      {
        ?stmt pr:P143 ?item
      }
      GROUP BY ?item
      HAVING(?ct > 100)          
      ORDER BY DESC(?ct)
      LIMIT 100
    }
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }
  ORDER BY DESC(?ct) ASC(?itemLabel)